diff --git a/src/main/java/li/cil/oc/api/API.java b/src/main/java/li/cil/oc/api/API.java
index 5e277005b..3497915e9 100644
--- a/src/main/java/li/cil/oc/api/API.java
+++ b/src/main/java/li/cil/oc/api/API.java
@@ -12,7 +12,7 @@ import li.cil.oc.api.detail.*;
  */
 public class API {
     public static final String ID_OWNER = "OpenComputers|Core";
-    public static final String VERSION = "5.4.0";
+    public static final String VERSION = "5.5.0";
 
     public static DriverAPI driver = null;
     public static FileSystemAPI fileSystem = null;
diff --git a/src/main/java/li/cil/oc/api/Items.java b/src/main/java/li/cil/oc/api/Items.java
index a10182d6c..81a10bc2f 100644
--- a/src/main/java/li/cil/oc/api/Items.java
+++ b/src/main/java/li/cil/oc/api/Items.java
@@ -1,8 +1,11 @@
 package li.cil.oc.api;
 
 import li.cil.oc.api.detail.ItemInfo;
+import net.minecraft.item.EnumDyeColor;
 import net.minecraft.item.ItemStack;
 
+import java.util.concurrent.Callable;
+
 /**
  * Access to item definitions for all blocks and items provided by
  * OpenComputers.
@@ -44,6 +47,53 @@ public final class Items {
         return null;
     }
 
+    /**
+     * Register a single loot floppy disk.
+     * <p/>
+     * The disk will be listed in the creative tab of OpenComputers.
+     * <p/>
+     * The specified factory callable will be used to generate a new file
+     * system when the loot disk is used as a component. The specified name
+     * will be used as the label for the loot disk, as well as the identifier
+     * to select the corresponding factory method, so choose wisely.
+     * <p/>
+     * To use some directory in your mod JAR as the directory provided by the
+     * loot disk, use {@link FileSystem#fromClass} in your callable.
+     *
+     * @param name    the label and identifier to use for the loot disk.
+     * @param color   the color of the disk, as a Minecraft color.
+     * @param factory the callable to call for creating file system instances.
+     * @return an item stack representing the registered loot disk, to allow
+     * adding a recipe for your loot disk, for example.
+     */
+    public static ItemStack registerFloppy(String name, EnumDyeColor color, Callable<li.cil.oc.api.fs.FileSystem> factory) {
+        if (API.items != null)
+            return API.items.registerFloppy(name, color, factory);
+        return null;
+    }
+
+    /**
+     * Register a single custom EEPROM.
+     * <p/>
+     * The EEPROM will be listed in the creative tab of OpenComputers.
+     * <p/>
+     * The EEPROM will be initialized with the specified code and data byte
+     * arrays. For script code (e.g. a Lua script) use <tt>String.getBytes("UTF-8")</tt>.
+     * You can omit any of the arguments by passing <tt>null</tt>.
+     *
+     * @param name     the label of the EEPROM.
+     * @param code     the code section of the EEPROM.
+     * @param data     the data section of the EEPROM.
+     * @param readonly whether the code section is read-only.
+     * @return an item stack representing the registered EEPROM, to allow
+     * adding a recipe for your custom BIOS, for example.
+     */
+    public static ItemStack registerEEPROM(String name, byte[] code, byte[] data, boolean readonly) {
+        if (API.items != null)
+            return API.items.registerEEPROM(name, code, data, readonly);
+        return null;
+    }
+
     // ----------------------------------------------------------------------- //
 
     private Items() {
diff --git a/src/main/java/li/cil/oc/api/detail/ItemAPI.java b/src/main/java/li/cil/oc/api/detail/ItemAPI.java
index 8ae9f334d..358472c48 100644
--- a/src/main/java/li/cil/oc/api/detail/ItemAPI.java
+++ b/src/main/java/li/cil/oc/api/detail/ItemAPI.java
@@ -1,7 +1,11 @@
 package li.cil.oc.api.detail;
 
+import li.cil.oc.api.FileSystem;
+import net.minecraft.item.EnumDyeColor;
 import net.minecraft.item.ItemStack;
 
+import java.util.concurrent.Callable;
+
 public interface ItemAPI {
     /**
      * Get a descriptor object for the block or item with the specified name.
@@ -26,4 +30,47 @@ public interface ItemAPI {
      * if the stack is not a valid OpenComputers item or block.
      */
     ItemInfo get(ItemStack stack);
+
+    /**
+     * Register a single loot floppy disk.
+     * <p/>
+     * The disk will be listed in the creative tab of OpenComputers.
+     * <p/>
+     * The specified factory callable will be used to generate a new file
+     * system when the loot disk is used as a component. The specified name
+     * will be used as the label for the loot disk, as well as the identifier
+     * to select the corresponding factory method, so choose wisely.
+     * <p/>
+     * To use some directory in your mod JAR as the directory provided by the
+     * loot disk, use {@link FileSystem#fromClass} in your callable.
+     * <p/>
+     * Call this in the init phase or later, <em>not</em> in pre-init.
+     *
+     * @param name    the label and identifier to use for the loot disk.
+     * @param color   the color of the disk, as a Minecraft color.
+     * @param factory the callable to call for creating file system instances.
+     * @return an item stack representing the registered loot disk, to allow
+     * adding a recipe for your loot disk, for example.
+     */
+    ItemStack registerFloppy(String name, EnumDyeColor color, Callable<li.cil.oc.api.fs.FileSystem> factory);
+
+    /**
+     * Register a single custom EEPROM.
+     * <p/>
+     * The EEPROM will be listed in the creative tab of OpenComputers.
+     * <p/>
+     * The EEPROM will be initialized with the specified code and data byte
+     * arrays. For script code (e.g. a Lua script) use <tt>String.getBytes("UTF-8")</tt>.
+     * You can omit any of the arguments by passing <tt>null</tt>.
+     * <p/>
+     * Call this in the init phase or later, <em>not</em> in pre-init.
+     *
+     * @param name     the label of the EEPROM.
+     * @param code     the code section of the EEPROM.
+     * @param data     the data section of the EEPROM.
+     * @param readonly whether the code section is read-only.
+     * @return an item stack representing the registered EEPROM, to allow
+     * adding a recipe for your custom BIOS, for example.
+     */
+    ItemStack registerEEPROM(String name, byte[] code, byte[] data, boolean readonly);
 }
diff --git a/src/main/resources/assets/opencomputers/loot/loot.properties b/src/main/resources/assets/opencomputers/loot/loot.properties
index 95e955686..b7f6a3b68 100644
--- a/src/main/resources/assets/opencomputers/loot/loot.properties
+++ b/src/main/resources/assets/opencomputers/loot/loot.properties
@@ -10,7 +10,7 @@ MazeGen=maze:1:dyeOrange
 Network=network:1:dyeLime
 OpenIRC=irc:1:dyeLightBlue
 OpenLoader=openloader:1:dyeMagenta
-OpenOS=openos:0:dyeGreen
+OpenOS=openOS:0:dyeGreen
 OPPM=oppm:0:dyeCyan
 # Higher chance to find the dig program, because it has the most immediate
 # use - OpenOS is craftable and IRC can be downloaded once an internet card
diff --git a/src/main/resources/assets/opencomputers/recipes/default.recipes b/src/main/resources/assets/opencomputers/recipes/default.recipes
index b3d54f0fa..d1e29ac97 100644
--- a/src/main/resources/assets/opencomputers/recipes/default.recipes
+++ b/src/main/resources/assets/opencomputers/recipes/default.recipes
@@ -365,7 +365,6 @@ chameliumBlock {
           ["oc:chamelium", "oc:chamelium", "oc:chamelium"],
           ["oc:chamelium", "oc:chamelium", "oc:chamelium"]]
 }
-
 endstone {
   input: [[enderPearl, "oc:chameliumBlock", enderPearl]
           ["oc:chameliumBlock", enderPearl, "oc:chameliumBlock"]
diff --git a/src/main/scala/li/cil/oc/client/PacketHandler.scala b/src/main/scala/li/cil/oc/client/PacketHandler.scala
index 72c02299a..44ac676af 100644
--- a/src/main/scala/li/cil/oc/client/PacketHandler.scala
+++ b/src/main/scala/li/cil/oc/client/PacketHandler.scala
@@ -7,6 +7,7 @@ import li.cil.oc.Settings
 import li.cil.oc.api.component
 import li.cil.oc.api.event.FileSystemAccessEvent
 import li.cil.oc.client.renderer.PetRenderer
+import li.cil.oc.common.Loot
 import li.cil.oc.common.PacketType
 import li.cil.oc.common.container
 import li.cil.oc.common.tileentity._
@@ -56,6 +57,7 @@ object PacketHandler extends CommonPacketHandler {
       case PacketType.HologramScale => onHologramScale(p)
       case PacketType.HologramTranslation => onHologramPositionOffsetY(p)
       case PacketType.HologramValues => onHologramValues(p)
+      case PacketType.LootDisk => onLootDisk(p)
       case PacketType.ParticleEffect => onParticleEffect(p)
       case PacketType.PetVisibility => onPetVisibility(p)
       case PacketType.PowerState => onPowerState(p)
@@ -250,6 +252,13 @@ object PacketHandler extends CommonPacketHandler {
       case _ => // Invalid packet.
     }
 
+  def onLootDisk(p: PacketParser) = {
+    val stack = p.readItemStack()
+    if (stack != null) {
+      Loot.disksForClient += stack
+    }
+  }
+
   def onParticleEffect(p: PacketParser) = {
     val dimension = p.readInt()
     world(p.player, dimension) match {
diff --git a/src/main/scala/li/cil/oc/common/Achievement.scala b/src/main/scala/li/cil/oc/common/Achievement.scala
index 1fd7c6a93..d4fe9c3c7 100644
--- a/src/main/scala/li/cil/oc/common/Achievement.scala
+++ b/src/main/scala/li/cil/oc/common/Achievement.scala
@@ -163,7 +163,7 @@ object Achievement {
   val OpenOS = newAchievement("openOS").
     at(10, 9).
     withParent(Floppy).
-    whenCrafting(Items.createOpenOS()).
+    whenCrafting(Constants.ItemName.OpenOS).
     add()
   val Raid = newAchievement("raid").
     at(8, 10).
diff --git a/src/main/scala/li/cil/oc/common/EventHandler.scala b/src/main/scala/li/cil/oc/common/EventHandler.scala
index 253688948..32929fa49 100644
--- a/src/main/scala/li/cil/oc/common/EventHandler.scala
+++ b/src/main/scala/li/cil/oc/common/EventHandler.scala
@@ -134,6 +134,7 @@ object EventHandler {
           player.addChatMessage(Localization.Chat.WarningSimpleComponent)
         }
         ServerPacketSender.sendPetVisibility(None, Some(player))
+        ServerPacketSender.sendLootDisks(player)
         // Do update check in local games and for OPs.
         if (!Mods.VersionChecker.isAvailable && (!MinecraftServer.getServer.isDedicatedServer || MinecraftServer.getServer.getConfigurationManager.canSendCommands(player.getGameProfile))) {
           Future {
@@ -149,8 +150,9 @@ object EventHandler {
   @SubscribeEvent
   def clientLoggedIn(e: ClientConnectedToServerEvent) {
     PetRenderer.isInitialized = false
-      PetRenderer.hidden.clear()
-      }
+    PetRenderer.hidden.clear()
+    Loot.disksForClient.clear()
+  }
 
   @SubscribeEvent
   def onBlockBreak(e: BlockEvent.BreakEvent): Unit = {
@@ -214,7 +216,7 @@ object EventHandler {
     didRecraft = recraft(e, navigationUpgrade, stack => {
       // Restore the map currently used in the upgrade.
       Option(api.Driver.driverFor(e.crafting)) match {
-        case Some(driver) => Option(ItemUtils.loadStack(driver.dataTag(stack).getCompoundTag(Settings.namespace + "map")))
+        case Some(driver) => Option(ItemStack.loadItemStackFromNBT(driver.dataTag(stack).getCompoundTag(Settings.namespace + "map")))
         case _ => None
       }
     }) || didRecraft
diff --git a/src/main/scala/li/cil/oc/common/Loot.scala b/src/main/scala/li/cil/oc/common/Loot.scala
index 9e23d9a56..d3bb5b64d 100644
--- a/src/main/scala/li/cil/oc/common/Loot.scala
+++ b/src/main/scala/li/cil/oc/common/Loot.scala
@@ -2,13 +2,17 @@ package li.cil.oc.common
 
 import java.io
 import java.util.Random
+import java.util.concurrent.Callable
 
 import li.cil.oc.Constants
 import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
+import li.cil.oc.api
+import li.cil.oc.api.fs.FileSystem
 import li.cil.oc.common.init.Items
 import li.cil.oc.util.Color
 import net.minecraft.inventory.IInventory
+import net.minecraft.item.EnumDyeColor
 import net.minecraft.item.Item
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -16,6 +20,7 @@ import net.minecraft.util.WeightedRandomChestContent
 import net.minecraftforge.common.ChestGenHooks
 import net.minecraftforge.common.DimensionManager
 import net.minecraftforge.event.world.WorldEvent
+import net.minecraftforge.fml.common.Loader
 import net.minecraftforge.fml.common.eventhandler.SubscribeEvent
 
 import scala.collection.convert.WrapAsScala._
@@ -28,16 +33,45 @@ object Loot extends WeightedRandomChestContent(new ItemStack(null: Item), 1, 1,
     ChestGenHooks.PYRAMID_JUNGLE_CHEST,
     ChestGenHooks.STRONGHOLD_LIBRARY)
 
-  val builtInDisks = mutable.Map.empty[String, (ItemStack, Int)]
+  val factories = mutable.Map.empty[String, Callable[FileSystem]]
+
+  val globalDisks = mutable.Map.empty[String, (ItemStack, Int)]
 
   val worldDisks = mutable.Map.empty[String, (ItemStack, Int)]
 
-  val disks = mutable.ArrayBuffer.empty[ItemStack]
+  val disksForSampling = mutable.ArrayBuffer.empty[ItemStack]
+
+  val disksForClient = mutable.ArrayBuffer.empty[ItemStack]
 
   def randomDisk(rng: Random) =
-    if (disks.length > 0) Some(disks(rng.nextInt(disks.length)))
+    if (disksForSampling.length > 0) Some(disksForSampling(rng.nextInt(disksForSampling.length)))
     else None
 
+  def registerLootDisk(name: String, color: EnumDyeColor, factory: Callable[FileSystem]): ItemStack = {
+    val mod = Loader.instance.activeModContainer.getModId
+
+    OpenComputers.log.info(s"Registering loot disk '$name' from mod $mod.")
+
+    val modSpecificName = mod + ":" + name
+
+    val data = new NBTTagCompound()
+    data.setString(Settings.namespace + "fs.label", name)
+
+    val nbt = new NBTTagCompound()
+    nbt.setTag(Settings.namespace + "data", data)
+
+    // Store this top level, so it won't get wiped on save.
+    nbt.setString(Settings.namespace + "lootFactory", modSpecificName)
+    nbt.setInteger(Settings.namespace + "color", color.getDyeDamage)
+
+    val stack = Items.get(Constants.ItemName.Floppy).createItemStack(1)
+    stack.setTagCompound(nbt)
+
+    Loot.factories += modSpecificName -> factory
+
+    stack.copy()
+  }
+
   def init() {
     for (container <- containers) {
       ChestGenHooks.addItem(container, Loot)
@@ -47,13 +81,13 @@ object Loot extends WeightedRandomChestContent(new ItemStack(null: Item), 1, 1,
     val listStream = getClass.getResourceAsStream("/assets/" + Settings.resourceDomain + "/loot/loot.properties")
     list.load(listStream)
     listStream.close()
-    parseLootDisks(list, builtInDisks)
+    parseLootDisks(list, globalDisks, external = false)
   }
 
   @SubscribeEvent
-  def initForWorld(e: WorldEvent.Load) {
+  def initForWorld(e: WorldEvent.Load): Unit = if (!e.world.isRemote && e.world.provider.getDimensionId == 0) {
     worldDisks.clear()
-    disks.clear()
+    disksForSampling.clear()
     if (!e.world.isRemote) {
       val path = new io.File(DimensionManager.getCurrentSaveRootDirectory, Settings.savePath + "loot/")
       if (path.exists && path.isDirectory) {
@@ -64,7 +98,7 @@ object Loot extends WeightedRandomChestContent(new ItemStack(null: Item), 1, 1,
             val list = new java.util.Properties()
             list.load(listStream)
             listStream.close()
-            parseLootDisks(list, worldDisks)
+            parseLootDisks(list, worldDisks, external = true)
           }
           catch {
             case t: Throwable => OpenComputers.log.warn("Failed opening loot descriptor file in saves folder.")
@@ -72,26 +106,26 @@ object Loot extends WeightedRandomChestContent(new ItemStack(null: Item), 1, 1,
         }
       }
     }
-    for ((name, entry) <- builtInDisks if !worldDisks.contains(name)) {
+    for ((name, entry) <- globalDisks if !worldDisks.contains(name)) {
       worldDisks += name -> entry
     }
     for ((_, (stack, count)) <- worldDisks) {
       for (i <- 0 until count) {
-        disks += stack
+        disksForSampling += stack
       }
     }
   }
 
-  private def parseLootDisks(list: java.util.Properties, acc: mutable.Map[String, (ItemStack, Int)]) {
+  private def parseLootDisks(list: java.util.Properties, acc: mutable.Map[String, (ItemStack, Int)], external: Boolean) {
     for (key <- list.stringPropertyNames) {
       val value = list.getProperty(key)
       try value.split(":") match {
         case Array(name, count, color) =>
-          acc += key -> ((createLootDisk(name, key, Some(color)), count.toInt))
+          acc += key -> ((createLootDisk(name, key, external, Color.byOreName.get(color)), count.toInt))
         case Array(name, count) =>
-          acc += key -> ((createLootDisk(name, key), count.toInt))
+          acc += key -> ((createLootDisk(name, key, external), count.toInt))
         case _ =>
-          acc += key -> ((createLootDisk(value, key), 1))
+          acc += key -> ((createLootDisk(value, key, external), 1))
       }
       catch {
         case t: Throwable => OpenComputers.log.warn("Bad loot descriptor: " + value, t)
@@ -99,24 +133,17 @@ object Loot extends WeightedRandomChestContent(new ItemStack(null: Item), 1, 1,
     }
   }
 
-  def createLootDisk(name: String, path: String, color: Option[String] = None) = {
-    val data = new NBTTagCompound()
-    data.setString(Settings.namespace + "fs.label", name)
-
-    val tag = new NBTTagCompound()
-    tag.setTag(Settings.namespace + "data", data)
-    // Store this top level, so it won't get wiped on save.
-    tag.setString(Settings.namespace + "lootPath", path)
-    color match {
-      case Some(oreDictName) =>
-        tag.setInteger(Settings.namespace + "color", Color.dyes.indexOf(oreDictName))
-      case _ =>
+  def createLootDisk(name: String, path: String, external: Boolean, color: Option[EnumDyeColor] = None) = {
+    val callable = if (external) new Callable[FileSystem] {
+      override def call(): FileSystem = api.FileSystem.fromSaveDirectory("loot/" + path, 0, false)
+    } else new Callable[FileSystem] {
+      override def call(): FileSystem = api.FileSystem.fromClass(OpenComputers.getClass, Settings.resourceDomain, "loot/" + path)
     }
-
-    val disk = Items.get(Constants.ItemName.Floppy).createItemStack(1)
-    disk.setTagCompound(tag)
-
-    disk
+    val stack = registerLootDisk(name, color.getOrElse(EnumDyeColor.SILVER), callable)
+    if (!external) {
+      Items.registerStack(stack, name)
+    }
+    stack
   }
 
   override def generateChestContent(random: Random, newInventory: IInventory) =
diff --git a/src/main/scala/li/cil/oc/common/PacketHandler.scala b/src/main/scala/li/cil/oc/common/PacketHandler.scala
index 0584dd893..6e8ba78c3 100644
--- a/src/main/scala/li/cil/oc/common/PacketHandler.scala
+++ b/src/main/scala/li/cil/oc/common/PacketHandler.scala
@@ -12,8 +12,8 @@ import li.cil.oc.api
 import li.cil.oc.common.block.RobotAfterimage
 import li.cil.oc.util.BlockPosition
 import li.cil.oc.util.ExtendedWorld._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.entity.player.EntityPlayer
+import net.minecraft.item.ItemStack
 import net.minecraft.nbt.CompressedStreamTools
 import net.minecraft.util.BlockPos
 import net.minecraft.util.EnumFacing
@@ -109,7 +109,7 @@ abstract class PacketHandler {
     def readItemStack() = {
       val haveStack = readBoolean()
       if (haveStack) {
-        ItemUtils.loadStack(readNBT())
+        ItemStack.loadItemStackFromNBT(readNBT())
       }
       else null
     }
diff --git a/src/main/scala/li/cil/oc/common/PacketType.scala b/src/main/scala/li/cil/oc/common/PacketType.scala
index 24bcd360e..94c6a744f 100644
--- a/src/main/scala/li/cil/oc/common/PacketType.scala
+++ b/src/main/scala/li/cil/oc/common/PacketType.scala
@@ -19,6 +19,7 @@ object PacketType extends Enumeration {
   HologramScale,
   HologramTranslation,
   HologramValues,
+  LootDisk,
   ParticleEffect,
   PetVisibility, // Goes both ways.
   PowerState,
diff --git a/src/main/scala/li/cil/oc/common/init/Items.scala b/src/main/scala/li/cil/oc/common/init/Items.scala
index 713262c74..0aa0ef649 100644
--- a/src/main/scala/li/cil/oc/common/init/Items.scala
+++ b/src/main/scala/li/cil/oc/common/init/Items.scala
@@ -1,12 +1,14 @@
 package li.cil.oc.common.init
 
 import java.util
+import java.util.concurrent.Callable
 
 import li.cil.oc.Constants
 import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
 import li.cil.oc.api.detail.ItemAPI
 import li.cil.oc.api.detail.ItemInfo
+import li.cil.oc.api.fs.FileSystem
 import li.cil.oc.common
 import li.cil.oc.common.Loot
 import li.cil.oc.common.Tier
@@ -22,6 +24,7 @@ import li.cil.oc.common.recipe.Recipes
 import li.cil.oc.integration.Mods
 import net.minecraft.block.Block
 import net.minecraft.creativetab.CreativeTabs
+import net.minecraft.item.EnumDyeColor
 import net.minecraft.item.Item
 import net.minecraft.item.ItemBlock
 import net.minecraft.item.ItemStack
@@ -111,6 +114,24 @@ object Items extends ItemAPI {
     instance
   }
 
+  def registerStack(stack: ItemStack, id: String) = {
+    val immutableStack = stack.copy()
+    descriptors += id -> new ItemInfo {
+      override def name = id
+
+      override def block = null
+
+      override def createItemStack(size: Int): ItemStack = {
+        val copy = immutableStack.copy()
+        copy.stackSize = size
+        copy
+      }
+
+      override def item = immutableStack.getItem
+    }
+    stack
+  }
+
   private def getBlockOrItem(stack: ItemStack): Any =
     if (stack == null) null
     else Delegator.subItem(stack).getOrElse(stack.getItem match {
@@ -120,24 +141,60 @@ object Items extends ItemAPI {
 
   // ----------------------------------------------------------------------- //
 
-  def createOpenOS(amount: Int = 1) = {
-    Loot.builtInDisks.get("OpenOS").map(_._1.copy()).orNull
+  val registeredItems = mutable.ArrayBuffer.empty[ItemStack]
+
+  override def registerFloppy(name: String, color: EnumDyeColor, factory: Callable[FileSystem]): ItemStack = {
+    val stack = Loot.registerLootDisk(name, color, factory)
+
+    registeredItems += stack
+
+    stack.copy()
   }
 
-  def createLuaBios(amount: Int = 1) = {
-    val data = new NBTTagCompound()
-    val code = new Array[Byte](4 * 1024)
-    val count = OpenComputers.getClass.getResourceAsStream(Settings.scriptPath + "bios.lua").read(code)
-    data.setByteArray(Settings.namespace + "eeprom", code.take(count))
-    data.setString(Settings.namespace + "label", "EEPROM (Lua BIOS)")
-
+  override def registerEEPROM(name: String, code: Array[Byte], data: Array[Byte], readonly: Boolean): ItemStack = {
     val nbt = new NBTTagCompound()
-    nbt.setTag(Settings.namespace + "data", data)
+    if (name != null) {
+      nbt.setString(Settings.namespace + "label", name.trim.take(16))
+    }
+    if (code != null) {
+      nbt.setByteArray(Settings.namespace + "eeprom", code.take(Settings.get.eepromSize))
+    }
+    if (data != null) {
+      nbt.setByteArray(Settings.namespace + "userdata", data.take(Settings.get.eepromDataSize))
+    }
+    nbt.setBoolean(Settings.namespace + "readonly", readonly)
 
-    val stack = get(Constants.ItemName.EEPROM).createItemStack(amount)
-    stack.setTagCompound(nbt)
+    val stackNbt = new NBTTagCompound()
+    stackNbt.setTag(Settings.namespace + "data", nbt)
 
-    stack
+    val stack = get(Constants.ItemName.EEPROM).createItemStack(1)
+    stack.setTagCompound(stackNbt)
+
+    registeredItems += stack
+
+    stack.copy()
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  // Nobody should use this anyway, since it's internal, but IIRC some people do, so let's be nice...
+  // TODO remove in OC 1.6
+  /**
+   * @deprecated use <tt>api.Items.get("openOS").createItemStack(amount)</tt> instead.
+   */
+  @Deprecated
+  def createOpenOS(amount: Int = 1) = {
+    get(Constants.ItemName.OpenOS).createItemStack(amount)
+  }
+
+  // Nobody should use this anyway, since it's internal, but IIRC some people do, so let's be nice...
+  // TODO remove in OC 1.6
+  /**
+   * @deprecated use <tt>api.Items.get("luaBios").createItemStack(amount)</tt> instead.
+   */
+  @Deprecated
+  def createLuaBios(amount: Int = 1) = {
+    get(Constants.ItemName.LuaBios).createItemStack(amount)
   }
 
   def createConfiguredDrone() = {
@@ -212,8 +269,8 @@ object Items extends ItemAPI {
       get(Constants.ItemName.RAMTier6).createItemStack(1),
       get(Constants.ItemName.RAMTier6).createItemStack(1),
 
-      createLuaBios(),
-      createOpenOS(),
+      get(Constants.ItemName.LuaBios).createItemStack(1),
+      get(Constants.ItemName.OpenOS).createItemStack(1),
       get(Constants.ItemName.HDDTier3).createItemStack(1)
     )
     data.containers = Array(
@@ -246,10 +303,10 @@ object Items extends ItemAPI {
       Option(get(Constants.ItemName.RAMTier6).createItemStack(1)),
       Option(get(Constants.ItemName.RAMTier6).createItemStack(1)),
 
-      Option(createLuaBios()),
+      Option(get(Constants.ItemName.LuaBios).createItemStack(1)),
       Option(get(Constants.ItemName.HDDTier3).createItemStack(1))
     ).padTo(32, None)
-    data.items(31) = Option(createOpenOS())
+    data.items(31) = Option(get(Constants.ItemName.OpenOS).createItemStack(1))
     data.container = Option(get(Constants.BlockName.DiskDrive).createItemStack(1))
 
     val stack = get(Constants.ItemName.Tablet).createItemStack(1)
@@ -401,14 +458,7 @@ object Items extends ItemAPI {
 
   // Storage media of all kinds.
   private def initStorage(): Unit = {
-    val storage = newItem(new item.Delegator() {
-      // Override to inject loot disks.
-      override def getSubItems(item: Item, tab: CreativeTabs, list: java.util.List[_]) {
-        super.getSubItems(item, tab, list)
-        Items.add(list, createLuaBios())
-        Loot.worldDisks.values.foreach(entry => Items.add(list, entry._1))
-      }
-    }, "storage")
+    val storage = newItem(new item.Delegator(), "storage")
 
     Recipes.addSubItem(new item.EEPROM(storage), Constants.ItemName.EEPROM, "oc:eeprom")
     Recipes.addSubItem(new item.FloppyDisk(storage), Constants.ItemName.Floppy, "oc:floppy")
@@ -416,7 +466,13 @@ object Items extends ItemAPI {
     Recipes.addSubItem(new item.HardDiskDrive(storage, Tier.Two), Constants.ItemName.HDDTier2, "oc:hdd2")
     Recipes.addSubItem(new item.HardDiskDrive(storage, Tier.Three), Constants.ItemName.HDDTier3, "oc:hdd3")
 
-    Recipes.addRecipe(createLuaBios(), Constants.ItemName.LuaBios)
+    val luaBios = {
+      val code = new Array[Byte](4 * 1024)
+      val count = OpenComputers.getClass.getResourceAsStream(Settings.scriptPath + "bios.lua").read(code)
+      registerEEPROM("EEPROM (Lua BIOS)", code.take(count), null, readonly = false)
+    }
+    Recipes.addStack(luaBios, Constants.ItemName.LuaBios)
+
   }
 
   // Special purpose items that don't fit into any other category.
@@ -427,7 +483,7 @@ object Items extends ItemAPI {
         Items.createConfiguredMicrocontroller(),
         Items.createConfiguredRobot(),
         Items.createConfiguredTablet()
-      )
+      ) ++ Loot.disksForClient ++ registeredItems
 
       override def getSubItems(item: Item, tab: CreativeTabs, list: util.List[_]): Unit = {
         super.getSubItems(item, tab, list)
diff --git a/src/main/scala/li/cil/oc/common/inventory/Inventory.scala b/src/main/scala/li/cil/oc/common/inventory/Inventory.scala
index 1f62f27b8..b1c42f3a3 100644
--- a/src/main/scala/li/cil/oc/common/inventory/Inventory.scala
+++ b/src/main/scala/li/cil/oc/common/inventory/Inventory.scala
@@ -3,7 +3,6 @@ package li.cil.oc.common.inventory
 import li.cil.oc.Localization
 import li.cil.oc.Settings
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.inventory.IInventory
 import net.minecraft.item.ItemStack
@@ -98,7 +97,7 @@ trait Inventory extends IInventory {
     nbt.getTagList(Settings.namespace + "items", NBT.TAG_COMPOUND).foreach((slotNbt: NBTTagCompound) => {
       val slot = slotNbt.getByte("slot")
       if (slot >= 0 && slot < items.length) {
-        updateItems(slot, ItemUtils.loadStack(slotNbt.getCompoundTag("item")))
+        updateItems(slot, ItemStack.loadItemStackFromNBT(slotNbt.getCompoundTag("item")))
       }
     })
   }
diff --git a/src/main/scala/li/cil/oc/common/inventory/ItemStackInventory.scala b/src/main/scala/li/cil/oc/common/inventory/ItemStackInventory.scala
index bff8b9b74..9505eea54 100644
--- a/src/main/scala/li/cil/oc/common/inventory/ItemStackInventory.scala
+++ b/src/main/scala/li/cil/oc/common/inventory/ItemStackInventory.scala
@@ -1,7 +1,6 @@
 package li.cil.oc.common.inventory
 
 import li.cil.oc.Settings
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.nbt.NBTTagList
@@ -33,7 +32,7 @@ trait ItemStackInventory extends Inventory {
       for (i <- 0 until (list.tagCount min items.length)) {
         val tag = list.getCompoundTagAt(i)
         if (!tag.hasNoTags) {
-          updateItems(i, ItemUtils.loadStack(tag))
+          updateItems(i, ItemStack.loadItemStackFromNBT(tag))
         }
       }
     }
diff --git a/src/main/scala/li/cil/oc/common/item/data/MicrocontrollerData.scala b/src/main/scala/li/cil/oc/common/item/data/MicrocontrollerData.scala
index 67303f58d..73f690633 100644
--- a/src/main/scala/li/cil/oc/common/item/data/MicrocontrollerData.scala
+++ b/src/main/scala/li/cil/oc/common/item/data/MicrocontrollerData.scala
@@ -5,7 +5,6 @@ import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.common.Tier
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.util.Constants.NBT
@@ -25,7 +24,7 @@ class MicrocontrollerData extends ItemData {
   override def load(nbt: NBTTagCompound) {
     tier = nbt.getByte(Settings.namespace + "tier")
     components = nbt.getTagList(Settings.namespace + "components", NBT.TAG_COMPOUND).
-      toArray[NBTTagCompound].map(ItemUtils.loadStack).filter(_ != null)
+      toArray[NBTTagCompound].map(ItemStack.loadItemStackFromNBT).filter(_ != null)
     storedEnergy = nbt.getInteger(Settings.namespace + "storedEnergy")
 
     // Reserve slot for EEPROM if necessary, avoids having to resize the
diff --git a/src/main/scala/li/cil/oc/common/item/data/NavigationUpgradeData.scala b/src/main/scala/li/cil/oc/common/item/data/NavigationUpgradeData.scala
index 0173c41de..8ace83029 100644
--- a/src/main/scala/li/cil/oc/common/item/data/NavigationUpgradeData.scala
+++ b/src/main/scala/li/cil/oc/common/item/data/NavigationUpgradeData.scala
@@ -2,7 +2,6 @@ package li.cil.oc.common.item.data
 
 import li.cil.oc.Settings
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemMap
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -35,7 +34,7 @@ class NavigationUpgradeData extends ItemData {
 
   override def load(nbt: NBTTagCompound) {
     if (nbt.hasKey(Settings.namespace + "map")) {
-      map = ItemUtils.loadStack(nbt.getCompoundTag(Settings.namespace + "map"))
+      map = ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(Settings.namespace + "map"))
     }
   }
 
diff --git a/src/main/scala/li/cil/oc/common/item/data/RaidData.scala b/src/main/scala/li/cil/oc/common/item/data/RaidData.scala
index ec222f4c8..e9a9290e5 100644
--- a/src/main/scala/li/cil/oc/common/item/data/RaidData.scala
+++ b/src/main/scala/li/cil/oc/common/item/data/RaidData.scala
@@ -4,7 +4,6 @@ import li.cil.oc.Constants
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.util.Constants.NBT
@@ -23,7 +22,7 @@ class RaidData extends ItemData {
 
   override def load(nbt: NBTTagCompound): Unit = {
     disks = nbt.getTagList(Settings.namespace + "disks", NBT.TAG_COMPOUND).
-      toArray[NBTTagCompound].map(ItemUtils.loadStack)
+      toArray[NBTTagCompound].map(ItemStack.loadItemStackFromNBT)
     filesystem = nbt.getCompoundTag(Settings.namespace + "filesystem")
     if (nbt.hasKey(Settings.namespace + "label")) {
       label = Option(nbt.getString(Settings.namespace + "label"))
diff --git a/src/main/scala/li/cil/oc/common/item/data/RobotData.scala b/src/main/scala/li/cil/oc/common/item/data/RobotData.scala
index 1f7f9d7fd..ef587ac7e 100644
--- a/src/main/scala/li/cil/oc/common/item/data/RobotData.scala
+++ b/src/main/scala/li/cil/oc/common/item/data/RobotData.scala
@@ -8,7 +8,6 @@ import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.integration.opencomputers.DriverScreen
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.util.Constants.NBT
@@ -63,9 +62,9 @@ class RobotData extends ItemData {
     robotEnergy = nbt.getInteger(Settings.namespace + "robotEnergy")
     tier = nbt.getInteger(Settings.namespace + "tier")
     components = nbt.getTagList(Settings.namespace + "components", NBT.TAG_COMPOUND).
-      toArray[NBTTagCompound].map(ItemUtils.loadStack)
+      toArray[NBTTagCompound].map(ItemStack.loadItemStackFromNBT)
     containers = nbt.getTagList(Settings.namespace + "containers", NBT.TAG_COMPOUND).
-      toArray[NBTTagCompound].map(ItemUtils.loadStack)
+      toArray[NBTTagCompound].map(ItemStack.loadItemStackFromNBT)
     if (nbt.hasKey(Settings.namespace + "lightColor")) {
       lightColor = nbt.getInteger(Settings.namespace + "lightColor")
     }
diff --git a/src/main/scala/li/cil/oc/common/item/data/TabletData.scala b/src/main/scala/li/cil/oc/common/item/data/TabletData.scala
index 65b0faa4f..1f8629350 100644
--- a/src/main/scala/li/cil/oc/common/item/data/TabletData.scala
+++ b/src/main/scala/li/cil/oc/common/item/data/TabletData.scala
@@ -3,7 +3,6 @@ package li.cil.oc.common.item.data
 import li.cil.oc.Settings
 import li.cil.oc.common.Tier
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.util.Constants.NBT
@@ -25,7 +24,7 @@ class TabletData extends ItemData {
     nbt.getTagList(Settings.namespace + "items", NBT.TAG_COMPOUND).foreach((slotNbt: NBTTagCompound) => {
       val slot = slotNbt.getByte("slot")
       if (slot >= 0 && slot < items.length) {
-        items(slot) = Option(ItemUtils.loadStack(slotNbt.getCompoundTag("item")))
+        items(slot) = Option(ItemStack.loadItemStackFromNBT(slotNbt.getCompoundTag("item")))
       }
     })
     isRunning = nbt.getBoolean(Settings.namespace + "isRunning")
@@ -33,7 +32,7 @@ class TabletData extends ItemData {
     maxEnergy = nbt.getDouble(Settings.namespace + "maxEnergy")
     tier = nbt.getInteger(Settings.namespace + "tier")
     if (nbt.hasKey(Settings.namespace + "container")) {
-      container = Option(ItemUtils.loadStack(nbt.getCompoundTag(Settings.namespace + "container")))
+      container = Option(ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(Settings.namespace + "container")))
     }
   }
 
diff --git a/src/main/scala/li/cil/oc/common/recipe/ExtendedRecipe.scala b/src/main/scala/li/cil/oc/common/recipe/ExtendedRecipe.scala
index 1b51a9d43..c3e68d05c 100644
--- a/src/main/scala/li/cil/oc/common/recipe/ExtendedRecipe.scala
+++ b/src/main/scala/li/cil/oc/common/recipe/ExtendedRecipe.scala
@@ -6,7 +6,6 @@ import li.cil.oc.Constants
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.detail.ItemInfo
-import li.cil.oc.common.init.Items
 import li.cil.oc.common.item.data.DroneData
 import li.cil.oc.common.item.data.MicrocontrollerData
 import li.cil.oc.common.item.data.PrintData
@@ -28,7 +27,7 @@ import scala.util.control.Breaks._
 object ExtendedRecipe {
   private lazy val drone = api.Items.get(Constants.ItemName.Drone)
   private lazy val eeprom = api.Items.get(Constants.ItemName.EEPROM)
-  private lazy val luaBios = Items.createLuaBios()
+  private lazy val luaBios = api.Items.get(Constants.ItemName.LuaBios)
   private lazy val mcu = api.Items.get(Constants.BlockName.Microcontroller)
   private lazy val navigationUpgrade = api.Items.get(Constants.ItemName.NavigationUpgrade)
   private lazy val linkedCard = api.Items.get(Constants.ItemName.LinkedCard)
@@ -159,7 +158,7 @@ object ExtendedRecipe {
 
     // EEPROM copying.
     if (api.Items.get(craftedStack) == eeprom &&
-      !ItemStack.areItemStackTagsEqual(craftedStack, luaBios) &&
+      api.Items.get(craftedStack) != luaBios &&
       recipe.isInstanceOf[ExtendedShapelessOreRecipe] &&
       recipe.asInstanceOf[ExtendedShapelessOreRecipe].getInput != null &&
       recipe.asInstanceOf[ExtendedShapelessOreRecipe].getInput.size == 2) breakable {
diff --git a/src/main/scala/li/cil/oc/common/recipe/Recipes.scala b/src/main/scala/li/cil/oc/common/recipe/Recipes.scala
index 82a5fd70b..e2bf111de 100644
--- a/src/main/scala/li/cil/oc/common/recipe/Recipes.scala
+++ b/src/main/scala/li/cil/oc/common/recipe/Recipes.scala
@@ -80,6 +80,13 @@ object Recipes {
     delegate
   }
 
+  def addStack(stack: ItemStack, name: String, oreDict: String*) = {
+    Items.registerStack(stack, name)
+    addRecipe(stack, name)
+    register(stack, oreDict: _*)
+    stack
+  }
+
   def addRecipe(stack: ItemStack, name: String) {
     list += stack -> name
   }
@@ -161,7 +168,7 @@ object Recipes {
         val lootRecipes = recipes.getConfigList("lootDisks")
         for (recipe <- lootRecipes) {
           val name = recipe.getString("name")
-          Loot.builtInDisks.get(name) match {
+          Loot.globalDisks.get(name) match {
             case Some((stack, _)) => addRecipe(stack, recipe, s"loot disk '$name'")
             case _ =>
               OpenComputers.log.warn(s"Failed adding recipe for loot disk '$name': No such global loot disk.")
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala b/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala
index 2046e2d7f..f28c3acb0 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Assembler.scala
@@ -11,7 +11,6 @@ import li.cil.oc.api.network._
 import li.cil.oc.common.template.AssemblerTemplates
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.util.EnumFacing
@@ -127,11 +126,11 @@ class Assembler extends traits.Environment with traits.PowerAcceptor with traits
   override def readFromNBTForServer(nbt: NBTTagCompound) {
     super.readFromNBTForServer(nbt)
     if (nbt.hasKey(Settings.namespace + "output")) {
-      output = Option(ItemUtils.loadStack(nbt.getCompoundTag(Settings.namespace + "output")))
+      output = Option(ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(Settings.namespace + "output")))
     }
     else if (nbt.hasKey(Settings.namespace + "robot")) {
       // Backwards compatibility.
-      output = Option(ItemUtils.loadStack(nbt.getCompoundTag(Settings.namespace + "robot")))
+      output = Option(ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(Settings.namespace + "robot")))
     }
     totalRequiredEnergy = nbt.getDouble(Settings.namespace + "total")
     requiredEnergy = nbt.getDouble(Settings.namespace + "remaining")
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Disassembler.scala b/src/main/scala/li/cil/oc/common/tileentity/Disassembler.scala
index e8ed3acc5..12835a3a5 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Disassembler.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Disassembler.scala
@@ -127,7 +127,7 @@ class Disassembler extends traits.Environment with traits.PowerAcceptor with tra
     super.readFromNBTForServer(nbt)
     queue.clear()
     queue ++= nbt.getTagList(Settings.namespace + "queue", NBT.TAG_COMPOUND).
-      map((tag: NBTTagCompound) => ItemUtils.loadStack(tag))
+      map((tag: NBTTagCompound) => ItemStack.loadItemStackFromNBT(tag))
     buffer = nbt.getDouble(Settings.namespace + "buffer")
     totalRequiredEnergy = nbt.getDouble(Settings.namespace + "total")
     isActive = queue.nonEmpty
diff --git a/src/main/scala/li/cil/oc/common/tileentity/DiskDrive.scala b/src/main/scala/li/cil/oc/common/tileentity/DiskDrive.scala
index 556f567a5..e995b17e1 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/DiskDrive.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/DiskDrive.scala
@@ -10,7 +10,6 @@ import li.cil.oc.common.Slot
 import li.cil.oc.common.Sound
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -80,7 +79,7 @@ class DiskDrive extends traits.Environment with traits.ComponentInventory with t
   override def writeToNBTForClient(nbt: NBTTagCompound) {
     super.writeToNBTForClient(nbt)
     if (nbt.hasKey("disk")) {
-      setInventorySlotContents(0, ItemUtils.loadStack(nbt.getCompoundTag("disk")))
+      setInventorySlotContents(0, ItemStack.loadItemStackFromNBT(nbt.getCompoundTag("disk")))
     }
   }
 }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Printer.scala b/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
index 1e8b70d0d..2b7c5a577 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Printer.scala
@@ -11,7 +11,6 @@ import li.cil.oc.api.network._
 import li.cil.oc.common.item.data.PrintData
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.inventory.ISidedInventory
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -278,7 +277,7 @@ class Printer extends traits.Environment with traits.Inventory with traits.Rotat
     isActive = nbt.getBoolean(Settings.namespace + "active")
     limit = nbt.getInteger(Settings.namespace + "limit")
     if (nbt.hasKey(Settings.namespace + "output")) {
-      output = Option(ItemUtils.loadStack(nbt.getCompoundTag(Settings.namespace + "output")))
+      output = Option(ItemStack.loadItemStackFromNBT(nbt.getCompoundTag(Settings.namespace + "output")))
     }
     totalRequiredEnergy = nbt.getDouble(Settings.namespace + "total")
     requiredEnergy = nbt.getDouble(Settings.namespace + "remaining")
diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala b/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala
index e1903ac4c..ebc84ea1f 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala
@@ -5,6 +5,7 @@ import li.cil.oc.Constants
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.driver.EnvironmentHost
+import li.cil.oc.common.Loot
 import li.cil.oc.common.Slot
 import li.cil.oc.common.item.Delegator
 import li.cil.oc.common.item.FloppyDisk
@@ -43,17 +44,31 @@ object DriverFileSystem extends Item {
     }
 
   private def createEnvironment(stack: ItemStack, capacity: Int, host: EnvironmentHost, speed: Int) = if (DimensionManager.getWorld(0) != null) {
-    // We have a bit of a chicken-egg problem here, because we want to use the
-    // node's address as the folder name... so we generate the address here,
-    // if necessary. No one will know, right? Right!?
-    val address = addressFromTag(dataTag(stack))
-    val isFloppy = api.Items.get(stack) == api.Items.get(Constants.ItemName.Floppy)
-    val fs = oc.api.FileSystem.fromSaveDirectory(address, capacity, Settings.get.bufferChanges)
-    val environment = oc.api.FileSystem.asManagedEnvironment(fs, new ReadWriteItemLabel(stack), host, Settings.resourceDomain + ":" + (if (isFloppy) "floppy_access" else "hdd_access"), speed)
-    if (environment != null && environment.node != null) {
-      environment.node.asInstanceOf[oc.server.network.Node].address = address
+    if (stack.hasTagCompound && stack.getTagCompound.hasKey(Settings.namespace + "lootFactory")) {
+      // Loot disk, create file system using factory callback.
+      Loot.factories.get(stack.getTagCompound.getString(Settings.namespace + "lootFactory")) match {
+        case Some(factory) =>
+          val label =
+            if (dataTag(stack).hasKey(Settings.namespace + "fs.label"))
+              dataTag(stack).getString(Settings.namespace + "fs.label")
+            else null
+          api.FileSystem.asManagedEnvironment(factory.call(), label, host, Settings.resourceDomain + ":floppy_access")
+        case _ => null // Invalid loot disk.
+      }
+    }
+    else {
+      // We have a bit of a chicken-egg problem here, because we want to use the
+      // node's address as the folder name... so we generate the address here,
+      // if necessary. No one will know, right? Right!?
+      val address = addressFromTag(dataTag(stack))
+      val isFloppy = api.Items.get(stack) == api.Items.get(Constants.ItemName.Floppy)
+      val fs = oc.api.FileSystem.fromSaveDirectory(address, capacity, Settings.get.bufferChanges)
+      val environment = oc.api.FileSystem.asManagedEnvironment(fs, new ReadWriteItemLabel(stack), host, Settings.resourceDomain + ":" + (if (isFloppy) "floppy_access" else "hdd_access"), speed)
+      if (environment != null && environment.node != null) {
+        environment.node.asInstanceOf[oc.server.network.Node].address = address
+      }
+      environment
     }
-    environment
   }
   else null
 
diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/DriverLootDisk.scala b/src/main/scala/li/cil/oc/integration/opencomputers/DriverLootDisk.scala
index 16156961b..fa463b563 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/DriverLootDisk.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/DriverLootDisk.scala
@@ -11,6 +11,9 @@ import li.cil.oc.common.Slot
 import net.minecraft.item.ItemStack
 import net.minecraftforge.common.DimensionManager
 
+// This is deprecated and kept for compatibility with old saves.
+// As of OC 1.5.10, loot disks are generated using normal floppies, and using
+// a factory system that allows third-party mods to register loot disks.
 object DriverLootDisk extends Item {
   override def worksWith(stack: ItemStack) = isOneOf(stack,
     api.Items.get(Constants.ItemName.Floppy)) &&
diff --git a/src/main/scala/li/cil/oc/server/PacketSender.scala b/src/main/scala/li/cil/oc/server/PacketSender.scala
index f0d5e61ef..f0d639768 100644
--- a/src/main/scala/li/cil/oc/server/PacketSender.scala
+++ b/src/main/scala/li/cil/oc/server/PacketSender.scala
@@ -215,6 +215,18 @@ object PacketSender {
     pb.sendToPlayersNearTileEntity(t)
   }
 
+  def sendLootDisks(p: EntityPlayerMP): Unit = {
+    // Sending as separate packets, because CompressedStreamTools hiccups otherwise...
+    val stacks = Loot.worldDisks.values.map(_._1)
+    for (stack <- stacks) {
+      val pb = new SimplePacketBuilder(PacketType.LootDisk)
+
+      pb.writeItemStack(stack)
+
+      pb.sendToPlayer(p)
+    }
+  }
+
   def sendParticleEffect(position: BlockPosition, particleType: EnumParticleTypes, count: Int, velocity: Double, direction: Option[EnumFacing] = None): Unit = if (count > 0) {
     val pb = new SimplePacketBuilder(PacketType.ParticleEffect)
 
diff --git a/src/main/scala/li/cil/oc/server/component/UpgradeGenerator.scala b/src/main/scala/li/cil/oc/server/component/UpgradeGenerator.scala
index b7f2d9655..73a0f791c 100644
--- a/src/main/scala/li/cil/oc/server/component/UpgradeGenerator.scala
+++ b/src/main/scala/li/cil/oc/server/component/UpgradeGenerator.scala
@@ -12,7 +12,6 @@ import li.cil.oc.api.machine.Context
 import li.cil.oc.api.network._
 import li.cil.oc.api.prefab
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.util.ItemUtils
 import net.minecraft.entity.item.EntityItem
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
@@ -149,7 +148,7 @@ class UpgradeGenerator(val host: EnvironmentHost with internal.Agent) extends pr
     super.load(nbt)
     romGenerator.foreach(_.load(nbt.getCompoundTag("romGenerator")))
     if (nbt.hasKey("inventory")) {
-      inventory = Option(ItemUtils.loadStack(nbt.getCompoundTag("inventory")))
+      inventory = Option(ItemStack.loadItemStackFromNBT(nbt.getCompoundTag("inventory")))
     }
     remainingTicks = nbt.getInteger("remainingTicks")
   }
diff --git a/src/main/scala/li/cil/oc/util/ItemUtils.scala b/src/main/scala/li/cil/oc/util/ItemUtils.scala
index 0da7adf79..669967573 100644
--- a/src/main/scala/li/cil/oc/util/ItemUtils.scala
+++ b/src/main/scala/li/cil/oc/util/ItemUtils.scala
@@ -47,12 +47,6 @@ object ItemUtils {
 
   def caseNameWithTierSuffix(name: String, tier: Int) = name + (if (tier == Tier.Four) "Creative" else (tier + 1).toString)
 
-  def loadStack(nbt: NBTTagCompound) = ItemStack.loadItemStackFromNBT(nbt)
-
-  def loadStack(data: Array[Byte]) = {
-    ItemStack.loadItemStackFromNBT(loadTag(data))
-  }
-
   def loadTag(data: Array[Byte]) = {
     val bais = new ByteArrayInputStream(data)
     CompressedStreamTools.readCompressed(bais)