diff --git a/src/main/java/li/cil/oc/api/FileSystem.java b/src/main/java/li/cil/oc/api/FileSystem.java
index 7d198dd7c..d177a38f5 100644
--- a/src/main/java/li/cil/oc/api/FileSystem.java
+++ b/src/main/java/li/cil/oc/api/FileSystem.java
@@ -147,7 +147,9 @@ public final class FileSystem {
      * @param label       the label of the file system.
      * @param host        the tile entity containing the file system.
      * @param accessSound the name of the sound effect to play when the file
-     *                    system is accessed.
+     *                    system is accessed. This has to be the fully
+     *                    qualified resource name, e.g.
+     *                    <tt>opencomputers:floppy_access</tt>.
      * @return the network node wrapping the file system.
      */
     public static ManagedEnvironment asManagedEnvironment(final li.cil.oc.api.fs.FileSystem fileSystem, final Label label, final EnvironmentHost host, final String accessSound) {
@@ -164,7 +166,9 @@ public final class FileSystem {
      * @param label       the read-only label of the file system.
      * @param host        the tile entity containing the file system.
      * @param accessSound the name of the sound effect to play when the file
-     *                    system is accessed.
+     *                    system is accessed. This has to be the fully
+     *                    qualified resource name, e.g.
+     *                    <tt>opencomputers:floppy_access</tt>.
      * @return the network node wrapping the file system.
      */
     public static ManagedEnvironment asManagedEnvironment(final li.cil.oc.api.fs.FileSystem fileSystem, final String label, final EnvironmentHost host, final String accessSound) {
diff --git a/src/main/java/li/cil/oc/api/driver/item/Container.java b/src/main/java/li/cil/oc/api/driver/item/Container.java
index 8abf54c76..e3e42a2fb 100644
--- a/src/main/java/li/cil/oc/api/driver/item/Container.java
+++ b/src/main/java/li/cil/oc/api/driver/item/Container.java
@@ -17,7 +17,7 @@ public interface Container extends Item {
      * The type of slot provided as the dynamic slot. This will usually be
      * for other upgrades, but may be for any type of item component.
      * <p/>
-     * While the driver's own type implicitly has to be 'Upgrade' and could
+     * While the driver's own type implicitly has to be 'Container' and could
      * therefore be used instead, this makes the intention more clear.
      *
      * @param stack the item stack to get the provided slot type for.
diff --git a/src/main/java/li/cil/oc/api/event/FileSystemAccessEvent.java b/src/main/java/li/cil/oc/api/event/FileSystemAccessEvent.java
new file mode 100644
index 000000000..70e96fd88
--- /dev/null
+++ b/src/main/java/li/cil/oc/api/event/FileSystemAccessEvent.java
@@ -0,0 +1,87 @@
+package li.cil.oc.api.event;
+
+import cpw.mods.fml.common.eventhandler.Cancelable;
+import cpw.mods.fml.common.eventhandler.Event;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraft.world.World;
+
+/**
+ * Fired on the <em>client side only</em>, signals file system access.
+ * <p/>
+ * This is used to play file system access sounds and render disk activity
+ * indicators on some containers (e.g. disk drive, computer, server).
+ * <p/>
+ * Use this to implement rendering of disk access indicators on you own
+ * containers / computers / drive bays.
+ * <p/>
+ * Canceling this event is provided to allow registering higher priority
+ * event handlers that override default behavior.
+ */
+@Cancelable
+public class FileSystemAccessEvent extends Event {
+    /**
+     * The name of the sound effect to play for the file system.
+     */
+    public final String sound;
+
+    /**
+     * The world the file system lives in.
+     */
+    public final World world;
+
+    /**
+     * The x coordinate of the file system's container.
+     */
+    public final double x;
+
+    /**
+     * The y coordinate of the file system's container.
+     */
+    public final double y;
+
+    /**
+     * The z coordinate of the file system's container.
+     */
+    public final double z;
+
+    /**
+     * The tile entity hosting the file system.
+     * <p/>
+     * <em>Important</em>: this can be <tt>null</tt>, which is usually the
+     * case when the container is an entity or item.
+     */
+    public final TileEntity tileEntity;
+
+    /**
+     * Constructor for tile entity hosted file systems.
+     *
+     * @param sound      the name of the sound effect to play.
+     * @param tileEntity the tile entity hosting the file system.
+     */
+    public FileSystemAccessEvent(String sound, TileEntity tileEntity) {
+        this.sound = sound;
+        this.world = tileEntity.getWorldObj();
+        this.x = tileEntity.xCoord + 0.5;
+        this.y = tileEntity.yCoord + 0.5;
+        this.z = tileEntity.zCoord + 0.5;
+        this.tileEntity = tileEntity;
+    }
+
+    /**
+     * Constructor for arbitrarily hosted file systems.
+     *
+     * @param sound the name of the sound effect to play.
+     * @param world the world the file system lives in.
+     * @param x     the x coordinate of the file system's container.
+     * @param y     the y coordinate of the file system's container.
+     * @param z     the z coordinate of the file system's container.
+     */
+    public FileSystemAccessEvent(String sound, World world, double x, double y, double z) {
+        this.sound = sound;
+        this.world = world;
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.tileEntity = null;
+    }
+}
diff --git a/src/main/java/li/cil/oc/api/event/RobotUsedTool.java b/src/main/java/li/cil/oc/api/event/RobotUsedToolEvent.java
similarity index 88%
rename from src/main/java/li/cil/oc/api/event/RobotUsedTool.java
rename to src/main/java/li/cil/oc/api/event/RobotUsedToolEvent.java
index fa62adfde..b0800a0f0 100644
--- a/src/main/java/li/cil/oc/api/event/RobotUsedTool.java
+++ b/src/main/java/li/cil/oc/api/event/RobotUsedToolEvent.java
@@ -3,7 +3,7 @@ package li.cil.oc.api.event;
 import li.cil.oc.api.tileentity.Robot;
 import net.minecraft.item.ItemStack;
 
-public class RobotUsedTool extends RobotEvent {
+public class RobotUsedToolEvent extends RobotEvent {
     /**
      * The tool that was used, before and after use.
      */
@@ -11,7 +11,7 @@ public class RobotUsedTool extends RobotEvent {
 
     protected double damageRate;
 
-    protected RobotUsedTool(Robot robot, ItemStack toolBeforeUse, ItemStack toolAfterUse, double damageRate) {
+    protected RobotUsedToolEvent(Robot robot, ItemStack toolBeforeUse, ItemStack toolAfterUse, double damageRate) {
         super(robot);
         this.toolBeforeUse = toolBeforeUse;
         this.toolAfterUse = toolAfterUse;
@@ -35,7 +35,7 @@ public class RobotUsedTool extends RobotEvent {
      * rate at which the tool should lose durability, which is used by the
      * experience upgrade, for example.
      */
-    public static class ComputeDamageRate extends RobotUsedTool {
+    public static class ComputeDamageRate extends RobotUsedToolEvent {
         public ComputeDamageRate(Robot robot, ItemStack toolBeforeUse, ItemStack toolAfterUse, double damageRate) {
             super(robot, toolBeforeUse, toolAfterUse, damageRate);
         }
@@ -62,7 +62,7 @@ public class RobotUsedTool extends RobotEvent {
      * durability that was lost. This may be required for tools where the
      * durability is stored in the item's NBT tag.
      */
-    public static class ApplyDamageRate extends RobotUsedTool {
+    public static class ApplyDamageRate extends RobotUsedToolEvent {
         public ApplyDamageRate(Robot robot, ItemStack toolBeforeUse, ItemStack toolAfterUse, double damageRate) {
             super(robot, toolBeforeUse, toolAfterUse, damageRate);
         }
diff --git a/src/main/scala/li/cil/oc/client/PacketHandler.scala b/src/main/scala/li/cil/oc/client/PacketHandler.scala
index b6c939502..4d5807618 100644
--- a/src/main/scala/li/cil/oc/client/PacketHandler.scala
+++ b/src/main/scala/li/cil/oc/client/PacketHandler.scala
@@ -6,16 +6,18 @@ import cpw.mods.fml.common.eventhandler.SubscribeEvent
 import cpw.mods.fml.common.network.FMLNetworkEvent.ClientCustomPacketEvent
 import li.cil.oc.Localization
 import li.cil.oc.api.component
+import li.cil.oc.api.event.FileSystemAccessEvent
 import li.cil.oc.api.network.ManagedEnvironment
 import li.cil.oc.client.renderer.PetRenderer
+import li.cil.oc.common.PacketType
 import li.cil.oc.common.tileentity._
 import li.cil.oc.common.tileentity.traits._
-import li.cil.oc.common.PacketType
 import li.cil.oc.common.{PacketHandler => CommonPacketHandler}
 import li.cil.oc.util.Audio
 import net.minecraft.client.Minecraft
 import net.minecraft.client.gui.GuiScreen
 import net.minecraft.entity.player.EntityPlayer
+import net.minecraftforge.common.MinecraftForge
 import net.minecraftforge.common.util.ForgeDirection
 import org.lwjgl.input.Keyboard
 
@@ -39,6 +41,7 @@ object PacketHandler extends CommonPacketHandler {
       case PacketType.ComputerState => onComputerState(p)
       case PacketType.ComputerUserList => onComputerUserList(p)
       case PacketType.DisassemblerActiveChange => onDisassemblerActiveChange(p)
+      case PacketType.FileSystemActivity => onFileSystemActivity(p)
       case PacketType.FloppyChange => onFloppyChange(p)
       case PacketType.HologramClear => onHologramClear(p)
       case PacketType.HologramColor => onHologramColor(p)
@@ -140,6 +143,23 @@ object PacketHandler extends CommonPacketHandler {
       case _ => // Invalid packet.
     }
 
+  def onFileSystemActivity(p: PacketParser) = {
+    val sound = p.readUTF()
+    if (p.readBoolean()) p.readTileEntity[net.minecraft.tileentity.TileEntity]() match {
+      case Some(t) =>
+        MinecraftForge.EVENT_BUS.post(new FileSystemAccessEvent(sound, t))
+      case _ => // Invalid packet.
+    }
+    else world(p.player, p.readInt()) match {
+      case Some(world) =>
+        val x = p.readDouble()
+        val y = p.readDouble()
+        val z = p.readDouble()
+        MinecraftForge.EVENT_BUS.post(new FileSystemAccessEvent(sound, world, x, y, z))
+      case _ => // Invalid packet.
+    }
+  }
+
   def onFloppyChange(p: PacketParser) =
     p.readTileEntity[DiskDrive]() match {
       case Some(t) => t.setInventorySlotContents(0, p.readItemStack())
diff --git a/src/main/scala/li/cil/oc/client/Proxy.scala b/src/main/scala/li/cil/oc/client/Proxy.scala
index 15359872f..a61dec025 100644
--- a/src/main/scala/li/cil/oc/client/Proxy.scala
+++ b/src/main/scala/li/cil/oc/client/Proxy.scala
@@ -16,6 +16,7 @@ import li.cil.oc.client.renderer.block.BlockRenderer
 import li.cil.oc.client.renderer.item.ItemRenderer
 import li.cil.oc.client.renderer.tileentity._
 import li.cil.oc.common.component.TextBuffer
+import li.cil.oc.common.event.FileAccessHandler
 import li.cil.oc.common.init.Items
 import li.cil.oc.common.tileentity
 import li.cil.oc.common.tileentity.ServerRack
@@ -60,6 +61,7 @@ private[oc] class Proxy extends CommonProxy {
     ClientRegistry.registerKeyBinding(KeyBindings.materialCosts)
     ClientRegistry.registerKeyBinding(KeyBindings.clipboardPaste)
 
+    MinecraftForge.EVENT_BUS.register(FileAccessHandler)
     MinecraftForge.EVENT_BUS.register(PetRenderer)
     MinecraftForge.EVENT_BUS.register(ServerRack)
     MinecraftForge.EVENT_BUS.register(TextBuffer)
diff --git a/src/main/scala/li/cil/oc/common/PacketBuilder.scala b/src/main/scala/li/cil/oc/common/PacketBuilder.scala
index a595b7ee3..6e59be041 100644
--- a/src/main/scala/li/cil/oc/common/PacketBuilder.scala
+++ b/src/main/scala/li/cil/oc/common/PacketBuilder.scala
@@ -44,9 +44,9 @@ abstract class PacketBuilder(stream: OutputStream) extends DataOutputStream(stre
 
   def sendToAllPlayers() = OpenComputers.channel.sendToAll(packet)
 
-  def sendToNearbyPlayers(t: TileEntity, range: Double = 1024): Unit = sendToNearbyPlayers(t.getWorldObj, t.xCoord + 0.5, t.yCoord + 0.5, t.zCoord + 0.5, range)
+  def sendToPlayersNearTileEntity(t: TileEntity, range: Double = 1024): Unit = sendToNearbyPlayers(t.getWorldObj, t.xCoord + 0.5, t.yCoord + 0.5, t.zCoord + 0.5, range)
 
-  def sendToNearbyPlayers(host: EnvironmentHost): Unit = sendToNearbyPlayers(host.world, host.xPosition, host.yPosition, host.zPosition, 1024)
+  def sendToPlayersNearHost(host: EnvironmentHost, range: Double = 1024): Unit = sendToNearbyPlayers(host.world, host.xPosition, host.yPosition, host.zPosition, range)
 
   def sendToNearbyPlayers(world: World, x: Double, y: Double, z: Double, range: Double) {
     val dimension = world.provider.dimensionId
diff --git a/src/main/scala/li/cil/oc/common/PacketType.scala b/src/main/scala/li/cil/oc/common/PacketType.scala
index 54e84575e..005af9050 100644
--- a/src/main/scala/li/cil/oc/common/PacketType.scala
+++ b/src/main/scala/li/cil/oc/common/PacketType.scala
@@ -10,6 +10,7 @@ object PacketType extends Enumeration {
   ComputerState,
   ComputerUserList,
   DisassemblerActiveChange,
+  FileSystemActivity,
   FloppyChange,
   HologramClear,
   HologramColor,
diff --git a/src/main/scala/li/cil/oc/common/component/TextBuffer.scala b/src/main/scala/li/cil/oc/common/component/TextBuffer.scala
index d8b1387cf..ef1b7482b 100644
--- a/src/main/scala/li/cil/oc/common/component/TextBuffer.scala
+++ b/src/main/scala/li/cil/oc/common/component/TextBuffer.scala
@@ -118,7 +118,7 @@ class TextBuffer(val host: EnvironmentHost) extends prefab.ManagedEnvironment wi
     }
 
     this.synchronized {
-      _pendingCommands.foreach(_.sendToNearbyPlayers(host))
+      _pendingCommands.foreach(_.sendToPlayersNearHost(host))
       _pendingCommands = None
     }
   }
diff --git a/src/main/scala/li/cil/oc/common/event/ExperienceUpgradeHandler.scala b/src/main/scala/li/cil/oc/common/event/ExperienceUpgradeHandler.scala
index a08d505cc..7b3a6564f 100644
--- a/src/main/scala/li/cil/oc/common/event/ExperienceUpgradeHandler.scala
+++ b/src/main/scala/li/cil/oc/common/event/ExperienceUpgradeHandler.scala
@@ -1,11 +1,11 @@
 package li.cil.oc.common.event
 
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
+import li.cil.oc.Localization
+import li.cil.oc.Settings
 import li.cil.oc.api.event._
 import li.cil.oc.api.tileentity.Robot
 import li.cil.oc.server.component
-import li.cil.oc.Localization
-import li.cil.oc.Settings
 import org.lwjgl.opengl.GL11
 
 object ExperienceUpgradeHandler {
@@ -19,7 +19,7 @@ object ExperienceUpgradeHandler {
   }
 
   @SubscribeEvent
-  def onRobotComputeDamageRate(e: RobotUsedTool.ComputeDamageRate) {
+  def onRobotComputeDamageRate(e: RobotUsedToolEvent.ComputeDamageRate) {
     e.setDamageRate(e.getDamageRate * math.max(0, 1 - getLevel(e.robot) * Settings.get.toolEfficiencyPerLevel))
   }
 
diff --git a/src/main/scala/li/cil/oc/common/event/FileAccessHandler.scala b/src/main/scala/li/cil/oc/common/event/FileAccessHandler.scala
new file mode 100644
index 000000000..ba21e128c
--- /dev/null
+++ b/src/main/scala/li/cil/oc/common/event/FileAccessHandler.scala
@@ -0,0 +1,13 @@
+package li.cil.oc.common.event
+
+import cpw.mods.fml.common.eventhandler.SubscribeEvent
+import li.cil.oc.Settings
+import li.cil.oc.api.event.FileSystemAccessEvent
+
+object FileAccessHandler {
+  @SubscribeEvent
+  def onFileSystemAccess(e: FileSystemAccessEvent) {
+    val volume = Settings.get.soundVolume
+    e.world.playSound(e.x, e.y, e.z, e.sound, volume, 1, false)
+  }
+}
diff --git a/src/main/scala/li/cil/oc/common/event/RedstoneFluxToolHandler.scala b/src/main/scala/li/cil/oc/common/event/RedstoneFluxToolHandler.scala
index 0f739deb6..5009ca020 100644
--- a/src/main/scala/li/cil/oc/common/event/RedstoneFluxToolHandler.scala
+++ b/src/main/scala/li/cil/oc/common/event/RedstoneFluxToolHandler.scala
@@ -2,11 +2,11 @@ package li.cil.oc.common.event
 
 import cofh.api.energy.IEnergyContainerItem
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
-import li.cil.oc.api.event.RobotUsedTool
+import li.cil.oc.api.event.RobotUsedToolEvent
 
 object RedstoneFluxToolHandler {
   @SubscribeEvent
-  def onRobotApplyDamageRate(e: RobotUsedTool.ApplyDamageRate) {
+  def onRobotApplyDamageRate(e: RobotUsedToolEvent.ApplyDamageRate) {
     (e.toolBeforeUse.getItem, e.toolAfterUse.getItem) match {
       case (energyBefore: IEnergyContainerItem, energyAfter: IEnergyContainerItem) =>
         val damage = energyBefore.getEnergyStored(e.toolBeforeUse) - energyAfter.getEnergyStored(e.toolAfterUse)
diff --git a/src/main/scala/li/cil/oc/common/event/RobotCommonHandler.scala b/src/main/scala/li/cil/oc/common/event/RobotCommonHandler.scala
index 0ff2fc283..c347c0140 100644
--- a/src/main/scala/li/cil/oc/common/event/RobotCommonHandler.scala
+++ b/src/main/scala/li/cil/oc/common/event/RobotCommonHandler.scala
@@ -1,11 +1,11 @@
 package li.cil.oc.common.event
 
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
-import li.cil.oc.api.event.RobotUsedTool
+import li.cil.oc.api.event.RobotUsedToolEvent
 
 object RobotCommonHandler {
   @SubscribeEvent
-  def onRobotApplyDamageRate(e: RobotUsedTool.ApplyDamageRate) {
+  def onRobotApplyDamageRate(e: RobotUsedToolEvent.ApplyDamageRate) {
     if (e.toolAfterUse.isItemStackDamageable) {
       val damage = e.toolAfterUse.getItemDamage - e.toolBeforeUse.getItemDamage
       if (damage > 0) {
diff --git a/src/main/scala/li/cil/oc/common/event/TinkersConstructToolHandler.scala b/src/main/scala/li/cil/oc/common/event/TinkersConstructToolHandler.scala
index cd6b059b1..1b6ceedbb 100644
--- a/src/main/scala/li/cil/oc/common/event/TinkersConstructToolHandler.scala
+++ b/src/main/scala/li/cil/oc/common/event/TinkersConstructToolHandler.scala
@@ -1,14 +1,14 @@
 package li.cil.oc.common.event
 
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
-import li.cil.oc.api.event.RobotUsedTool
+import li.cil.oc.api.event.RobotUsedToolEvent
 import net.minecraft.item.ItemStack
 
 object TinkersConstructToolHandler {
   def isTinkerTool(stack: ItemStack) = stack.hasTagCompound && stack.getTagCompound.hasKey("InfiTool")
 
   @SubscribeEvent
-  def onRobotApplyDamageRate(e: RobotUsedTool.ApplyDamageRate) {
+  def onRobotApplyDamageRate(e: RobotUsedToolEvent.ApplyDamageRate) {
     if (isTinkerTool(e.toolBeforeUse)) {
       val nbtBefore = e.toolBeforeUse.getTagCompound.getCompoundTag("InfiTool")
       val nbtAfter = e.toolAfterUse.getTagCompound.getCompoundTag("InfiTool")
diff --git a/src/main/scala/li/cil/oc/common/event/UniversalElectricityToolHandler.scala b/src/main/scala/li/cil/oc/common/event/UniversalElectricityToolHandler.scala
index 6b51eb542..fea727314 100644
--- a/src/main/scala/li/cil/oc/common/event/UniversalElectricityToolHandler.scala
+++ b/src/main/scala/li/cil/oc/common/event/UniversalElectricityToolHandler.scala
@@ -1,12 +1,12 @@
 package li.cil.oc.common.event
 
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
-import li.cil.oc.api.event.RobotUsedTool
+import li.cil.oc.api.event.RobotUsedToolEvent
 import li.cil.oc.util.mods.UniversalElectricity
 
 object UniversalElectricityToolHandler {
   @SubscribeEvent
-  def onRobotApplyDamageRate(e: RobotUsedTool.ApplyDamageRate) {
+  def onRobotApplyDamageRate(e: RobotUsedToolEvent.ApplyDamageRate) {
     if (UniversalElectricity.isEnergyItem(e.toolAfterUse)) {
       val damage = UniversalElectricity.getEnergyInItem(e.toolBeforeUse) - UniversalElectricity.getEnergyInItem(e.toolAfterUse)
       if (damage > 0) {
diff --git a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
index 0992ff8fd..cd7d10788 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
@@ -194,7 +194,7 @@ class Robot extends traits.Computer with traits.PowerInformation with tileentity
               }
               else {
                 world.playSound(nx + 0.5, ny + 0.5, nz + 0.5, "liquid.water",
-                  world.rand.nextFloat * 0.25F + 0.75F, world.rand.nextFloat * 1.0F + 0.5F, false)
+                  world.rand.nextFloat * 0.25f + 0.75f, world.rand.nextFloat * 1.0f + 0.5f, false)
               }
             }
           }
diff --git a/src/main/scala/li/cil/oc/server/PacketSender.scala b/src/main/scala/li/cil/oc/server/PacketSender.scala
index fab863ab6..4a92ebb81 100644
--- a/src/main/scala/li/cil/oc/server/PacketSender.scala
+++ b/src/main/scala/li/cil/oc/server/PacketSender.scala
@@ -11,6 +11,8 @@ import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.world.World
 import net.minecraftforge.common.util.ForgeDirection
 
+import scala.collection.mutable
+
 object PacketSender {
   def sendAbstractBusState(t: AbstractBusAware) {
     val pb = new SimplePacketBuilder(PacketType.AbstractBusState)
@@ -18,7 +20,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeBoolean(t.isAbstractBusAvailable)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendAnalyze(address: String, player: EntityPlayerMP) {
@@ -36,7 +38,7 @@ object PacketSender {
     pb.writeDouble(t.chargeSpeed)
     pb.writeBoolean(t.hasPower)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendColorChange(t: Colored) {
@@ -45,7 +47,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeInt(t.color)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendComputerState(t: Computer) {
@@ -54,7 +56,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeBoolean(t.isRunning)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendComputerUserList(t: Computer, list: Array[String]) {
@@ -64,7 +66,7 @@ object PacketSender {
     pb.writeInt(list.length)
     list.foreach(pb.writeUTF)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendDisassemblerActive(t: tileentity.Disassembler, active: Boolean) {
@@ -73,7 +75,35 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeBoolean(active)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
+  }
+
+  // Avoid spamming the network with disk activity notices.
+  val fileSystemAccessTimeouts = mutable.WeakHashMap.empty[EnvironmentHost, mutable.Map[String, Long]]
+
+  def sendFileSystemActivity(host: EnvironmentHost, name: String) = fileSystemAccessTimeouts.synchronized {
+    fileSystemAccessTimeouts.get(host) match {
+      case Some(hostTimeouts) if hostTimeouts.getOrElse(name, 0L) > System.currentTimeMillis() => // Cooldown.
+      case _ =>
+        fileSystemAccessTimeouts.getOrElseUpdate(host, mutable.Map.empty) += name -> (System.currentTimeMillis() + 500)
+
+        val pb = new SimplePacketBuilder(PacketType.FileSystemActivity)
+
+        pb.writeUTF(name)
+        host match {
+          case t: net.minecraft.tileentity.TileEntity =>
+            pb.writeBoolean(true)
+            pb.writeTileEntity(t)
+          case _ =>
+            pb.writeBoolean(false)
+            pb.writeInt(host.world.provider.dimensionId)
+            pb.writeDouble(host.xPosition)
+            pb.writeDouble(host.yPosition)
+            pb.writeDouble(host.zPosition)
+        }
+
+        pb.sendToPlayersNearHost(host, 64)
+    }
   }
 
   def sendFloppyChange(t: tileentity.DiskDrive, stack: ItemStack = null) {
@@ -82,7 +112,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeItemStack(stack)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendHologramClear(t: tileentity.Hologram) {
@@ -90,7 +120,7 @@ object PacketSender {
 
     pb.writeTileEntity(t)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendHologramColor(t: tileentity.Hologram, index: Int, value: Int) {
@@ -100,7 +130,7 @@ object PacketSender {
     pb.writeInt(index)
     pb.writeInt(value)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendHologramPowerChange(t: tileentity.Hologram) {
@@ -109,7 +139,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeBoolean(t.hasPower)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendHologramScale(t: tileentity.Hologram) {
@@ -118,7 +148,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeDouble(t.scale)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendHologramSet(t: tileentity.Hologram) {
@@ -136,7 +166,7 @@ object PacketSender {
       }
     }
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendHologramOffset(t: tileentity.Hologram) {
@@ -147,7 +177,7 @@ object PacketSender {
     pb.writeDouble(t.translation.yCoord)
     pb.writeDouble(t.translation.zCoord)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
 
@@ -180,7 +210,7 @@ object PacketSender {
     pb.writeDouble(t.globalBuffer)
     pb.writeDouble(t.globalBufferSize)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendRedstoneState(t: RedstoneAware) {
@@ -192,7 +222,7 @@ object PacketSender {
       pb.writeByte(t.output(d))
     }
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendRobotAssembling(t: tileentity.RobotAssembler, assembling: Boolean) {
@@ -201,7 +231,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeBoolean(assembling)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearHost(t)
   }
 
   def sendRobotMove(t: tileentity.Robot, ox: Int, oy: Int, oz: Int, direction: ForgeDirection) {
@@ -214,7 +244,7 @@ object PacketSender {
     pb.writeInt(oz)
     pb.writeDirection(direction)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendRobotAnimateSwing(t: tileentity.Robot) {
@@ -223,7 +253,7 @@ object PacketSender {
     pb.writeTileEntity(t.proxy)
     pb.writeInt(t.animationTicksTotal)
 
-    pb.sendToNearbyPlayers(t, 64)
+    pb.sendToPlayersNearTileEntity(t, 64)
   }
 
   def sendRobotAnimateTurn(t: tileentity.Robot) {
@@ -233,7 +263,7 @@ object PacketSender {
     pb.writeByte(t.turnAxis)
     pb.writeInt(t.animationTicksTotal)
 
-    pb.sendToNearbyPlayers(t, 64)
+    pb.sendToPlayersNearTileEntity(t, 64)
   }
 
   def sendRobotInventory(t: tileentity.Robot, slot: Int, stack: ItemStack) {
@@ -243,7 +273,7 @@ object PacketSender {
     pb.writeInt(slot)
     pb.writeItemStack(stack)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendRobotSelectedSlotChange(t: tileentity.Robot) {
@@ -252,7 +282,7 @@ object PacketSender {
     pb.writeTileEntity(t.proxy)
     pb.writeInt(t.selectedSlot)
 
-    pb.sendToNearbyPlayers(t, 16)
+    pb.sendToPlayersNearTileEntity(t, 16)
   }
 
   def sendRotatableState(t: Rotatable) {
@@ -262,7 +292,7 @@ object PacketSender {
     pb.writeDirection(t.pitch)
     pb.writeDirection(t.yaw)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendSwitchActivity(t: tileentity.Switch) {
@@ -270,7 +300,7 @@ object PacketSender {
 
     pb.writeTileEntity(t)
 
-    pb.sendToNearbyPlayers(t, 64)
+    pb.sendToPlayersNearTileEntity(t, 64)
   }
 
   def appendTextBufferColorChange(pb: PacketBuilder, foreground: PackedColor.Color, background: PackedColor.Color) {
@@ -347,7 +377,7 @@ object PacketSender {
     pb.writeUTF(address)
     pb.writeBoolean(hasPower)
 
-    pb.sendToNearbyPlayers(host)
+    pb.sendToPlayersNearHost(host)
   }
 
   def sendScreenTouchMode(t: tileentity.Screen, value: Boolean) {
@@ -356,7 +386,7 @@ object PacketSender {
     pb.writeTileEntity(t)
     pb.writeBoolean(value)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendServerPresence(t: tileentity.ServerRack) {
@@ -371,7 +401,7 @@ object PacketSender {
         pb.writeBoolean(false)
     }
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendServerState(t: tileentity.ServerRack) {
@@ -381,7 +411,7 @@ object PacketSender {
     pb.writeInt(-1)
     pb.writeInt(t.range)
 
-    pb.sendToNearbyPlayers(t)
+    pb.sendToPlayersNearTileEntity(t)
   }
 
   def sendServerState(t: tileentity.ServerRack, number: Int, player: Option[EntityPlayerMP] = None) {
@@ -399,7 +429,7 @@ object PacketSender {
 
     player match {
       case Some(p) => pb.sendToPlayer(p)
-      case _ => pb.sendToNearbyPlayers(t)
+      case _ => pb.sendToPlayersNearTileEntity(t)
     }
   }
 
diff --git a/src/main/scala/li/cil/oc/server/component/FileSystem.scala b/src/main/scala/li/cil/oc/server/component/FileSystem.scala
index 3ce445c56..f17d9ba6b 100644
--- a/src/main/scala/li/cil/oc/server/component/FileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/component/FileSystem.scala
@@ -14,7 +14,7 @@ import li.cil.oc.api.machine.Callback
 import li.cil.oc.api.machine.Context
 import li.cil.oc.api.network._
 import li.cil.oc.api.prefab
-import li.cil.oc.common.Sound
+import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.nbt.NBTTagIntArray
@@ -65,21 +65,25 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
 
   @Callback(direct = true, doc = """function(path:string):boolean -- Returns whether an object exists at the specified absolute path in the file system.""")
   def exists(context: Context, args: Arguments): Array[AnyRef] = fileSystem.synchronized {
+    diskActivity()
     result(fileSystem.exists(clean(args.checkString(0))))
   }
 
   @Callback(direct = true, doc = """function(path:string):number -- Returns the size of the object at the specified absolute path in the file system.""")
   def size(context: Context, args: Arguments): Array[AnyRef] = fileSystem.synchronized {
+    diskActivity()
     result(fileSystem.size(clean(args.checkString(0))))
   }
 
   @Callback(direct = true, doc = """function(path:string):boolean -- Returns whether the object at the specified absolute path in the file system is a directory.""")
   def isDirectory(context: Context, args: Arguments): Array[AnyRef] = fileSystem.synchronized {
+    diskActivity()
     result(fileSystem.isDirectory(clean(args.checkString(0))))
   }
 
   @Callback(direct = true, doc = """function(path:string):number -- Returns the (real world) timestamp of when the object at the specified absolute path in the file system was modified.""")
   def lastModified(context: Context, args: Arguments): Array[AnyRef] = fileSystem.synchronized {
+    diskActivity()
     result(fileSystem.lastModified(clean(args.checkString(0))))
   }
 
@@ -87,7 +91,7 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
   def list(context: Context, args: Arguments): Array[AnyRef] = fileSystem.synchronized {
     Option(fileSystem.list(clean(args.checkString(0)))) match {
       case Some(list) =>
-        makeSomeNoise()
+        diskActivity()
         Array(list)
       case _ => null
     }
@@ -98,7 +102,7 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
     def recurse(path: String): Boolean = !fileSystem.exists(path) && (fileSystem.makeDirectory(path) ||
       (recurse(path.split("/").dropRight(1).mkString("/")) && fileSystem.makeDirectory(path)))
     val success = recurse(clean(args.checkString(0)))
-    if (success) makeSomeNoise()
+    diskActivity()
     result(success)
   }
 
@@ -107,14 +111,14 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
     def recurse(parent: String): Boolean = (!fileSystem.isDirectory(parent) ||
       fileSystem.list(parent).forall(child => recurse(parent + "/" + child))) && fileSystem.delete(parent)
     val success = recurse(clean(args.checkString(0)))
-    if (success) makeSomeNoise()
+    diskActivity()
     result(success)
   }
 
   @Callback(doc = """function(from:string, to:string):boolean -- Renames/moves an object from the first specified absolute path in the file system to the second.""")
   def rename(context: Context, args: Arguments): Array[AnyRef] = fileSystem.synchronized {
     val success = fileSystem.rename(clean(args.checkString(0)), clean(args.checkString(1)))
-    if (success) makeSomeNoise()
+    diskActivity()
     result(success)
   }
 
@@ -143,6 +147,7 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
     if (handle > 0) {
       owners.getOrElseUpdate(context.node.address, mutable.Set.empty[Int]) += handle
     }
+    diskActivity()
     result(handle)
   }
 
@@ -168,7 +173,7 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
           if (!node.tryChangeBuffer(-Settings.get.hddReadCost * bytes.length)) {
             throw new IOException("not enough energy")
           }
-          makeSomeNoise()
+          diskActivity()
           result(bytes)
         }
         else {
@@ -208,7 +213,7 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
     Option(fileSystem.getHandle(handle)) match {
       case Some(file) =>
         file.write(value)
-        makeSomeNoise()
+        diskActivity()
         result(true)
       case _ => throw new IOException("bad file descriptor")
     }
@@ -306,9 +311,9 @@ class FileSystem(val fileSystem: IFileSystem, var label: Label, val host: Option
     if (!owners.contains(owner) || !owners(owner).contains(handle))
       throw new IOException("bad file descriptor")
 
-  private def makeSomeNoise() {
+  private def diskActivity() {
     (sound, host) match {
-      case (Some(s), Some(h)) => Sound.play(h, s)
+      case (Some(s), Some(h)) => ServerPacketSender.sendFileSystemActivity(h, s)
       case _ =>
     }
   }
diff --git a/src/main/scala/li/cil/oc/server/component/robot/Player.scala b/src/main/scala/li/cil/oc/server/component/robot/Player.scala
index 0701b1004..829a499a7 100644
--- a/src/main/scala/li/cil/oc/server/component/robot/Player.scala
+++ b/src/main/scala/li/cil/oc/server/component/robot/Player.scala
@@ -5,21 +5,21 @@ import java.util.UUID
 import com.mojang.authlib.GameProfile
 import cpw.mods.fml.common.ObfuscationReflectionHelper
 import cpw.mods.fml.common.eventhandler.Event
+import li.cil.oc.OpenComputers
+import li.cil.oc.Settings
 import li.cil.oc.api.event._
 import li.cil.oc.common.tileentity
 import li.cil.oc.util.mods.Mods
 import li.cil.oc.util.mods.PortalGun
 import li.cil.oc.util.mods.TinkersConstruct
-import li.cil.oc.OpenComputers
-import li.cil.oc.Settings
 import net.minecraft.block.Block
 import net.minecraft.block.BlockPistonBase
-import net.minecraft.entity.item.EntityItem
-import net.minecraft.entity.player.EntityPlayer
-import net.minecraft.entity.player.EntityPlayer.EnumStatus
 import net.minecraft.entity.Entity
 import net.minecraft.entity.EntityLivingBase
 import net.minecraft.entity.IMerchant
+import net.minecraft.entity.item.EntityItem
+import net.minecraft.entity.player.EntityPlayer
+import net.minecraft.entity.player.EntityPlayer.EnumStatus
 import net.minecraft.init.Blocks
 import net.minecraft.init.Items
 import net.minecraft.item.ItemBlock
@@ -29,14 +29,14 @@ import net.minecraft.potion.PotionEffect
 import net.minecraft.server.MinecraftServer
 import net.minecraft.util._
 import net.minecraft.world.WorldServer
-import net.minecraftforge.common.util.FakePlayer
-import net.minecraftforge.common.util.ForgeDirection
 import net.minecraftforge.common.ForgeHooks
 import net.minecraftforge.common.MinecraftForge
+import net.minecraftforge.common.util.FakePlayer
+import net.minecraftforge.common.util.ForgeDirection
 import net.minecraftforge.event.ForgeEventFactory
-import net.minecraftforge.event.entity.player.PlayerInteractEvent.Action
 import net.minecraftforge.event.entity.player.EntityInteractEvent
 import net.minecraftforge.event.entity.player.PlayerInteractEvent
+import net.minecraftforge.event.entity.player.PlayerInteractEvent.Action
 import net.minecraftforge.event.world.BlockEvent
 import net.minecraftforge.fluids.FluidRegistry
 
@@ -397,10 +397,10 @@ class Player(val robot: tileentity.Robot) extends FakePlayer(robot.world.asInsta
   private def tryRepair(stack: ItemStack, oldStack: ItemStack) {
     // Only if the underlying type didn't change.
     if (stack.getItem == oldStack.getItem) {
-      val damageRate = new RobotUsedTool.ComputeDamageRate(robot, oldStack, stack, Settings.get.itemDamageRate)
+      val damageRate = new RobotUsedToolEvent.ComputeDamageRate(robot, oldStack, stack, Settings.get.itemDamageRate)
       MinecraftForge.EVENT_BUS.post(damageRate)
       if (damageRate.getDamageRate < 1) {
-        MinecraftForge.EVENT_BUS.post(new RobotUsedTool.ApplyDamageRate(robot, oldStack, stack, damageRate.getDamageRate))
+        MinecraftForge.EVENT_BUS.post(new RobotUsedToolEvent.ApplyDamageRate(robot, oldStack, stack, damageRate.getDamageRate))
       }
     }
   }
diff --git a/src/main/scala/li/cil/oc/server/driver/item/ComputerCraftMedia.scala b/src/main/scala/li/cil/oc/server/driver/item/ComputerCraftMedia.scala
index 334a142ad..3df6d4fd8 100644
--- a/src/main/scala/li/cil/oc/server/driver/item/ComputerCraftMedia.scala
+++ b/src/main/scala/li/cil/oc/server/driver/item/ComputerCraftMedia.scala
@@ -2,6 +2,7 @@ package li.cil.oc.server.driver.item
 
 import dan200.computercraft.api.media.IMedia
 import li.cil.oc
+import li.cil.oc.Settings
 import li.cil.oc.api.driver.EnvironmentHost
 import li.cil.oc.api.fs.Label
 import li.cil.oc.common.Slot
@@ -18,7 +19,7 @@ object ComputerCraftMedia extends Item {
     if (Mods.ComputerCraft.isAvailable && ComputerCraft.isDisk(stack) && host != null) {
       val address = addressFromTag(dataTag(stack))
       val mount = ComputerCraft.createDiskMount(stack, host.world)
-      Option(oc.api.FileSystem.asManagedEnvironment(mount, new ComputerCraftLabel(stack), host, "floppy_access")) match {
+      Option(oc.api.FileSystem.asManagedEnvironment(mount, new ComputerCraftLabel(stack), host, Settings.resourceDomain + ":floppy_access")) match {
         case Some(environment) =>
           environment.node.asInstanceOf[oc.server.network.Node].address = address
           environment
diff --git a/src/main/scala/li/cil/oc/server/driver/item/FileSystem.scala b/src/main/scala/li/cil/oc/server/driver/item/FileSystem.scala
index 3bcefdaef..078216560 100644
--- a/src/main/scala/li/cil/oc/server/driver/item/FileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/driver/item/FileSystem.scala
@@ -43,7 +43,7 @@ object FileSystem extends Item {
     val address = addressFromTag(dataTag(stack))
     val isFloppy = api.Items.get(stack) == api.Items.get("floppy")
     val fs = oc.api.FileSystem.fromSaveDirectory(address, capacity, Settings.get.bufferChanges)
-    val environment = oc.api.FileSystem.asManagedEnvironment(fs, new ReadWriteItemLabel(stack), host, if (isFloppy) "floppy_access" else "hdd_access")
+    val environment = oc.api.FileSystem.asManagedEnvironment(fs, new ReadWriteItemLabel(stack), host, Settings.resourceDomain + ":" + (if (isFloppy) "floppy_access" else "hdd_access"))
     if (environment != null && environment.node != null) {
       environment.node.asInstanceOf[oc.server.network.Node].address = address
     }
diff --git a/src/main/scala/li/cil/oc/server/driver/item/Loot.scala b/src/main/scala/li/cil/oc/server/driver/item/Loot.scala
index 8cd8829d3..71e244243 100644
--- a/src/main/scala/li/cil/oc/server/driver/item/Loot.scala
+++ b/src/main/scala/li/cil/oc/server/driver/item/Loot.scala
@@ -30,7 +30,7 @@ object Loot extends Item {
           dataTag(stack).getString(Settings.namespace + "fs.label")
         }
         else null
-      api.FileSystem.asManagedEnvironment(fs, label, host, "floppy_access")
+      api.FileSystem.asManagedEnvironment(fs, label, host, Settings.resourceDomain + ":floppy_access")
     }
     else null