diff --git a/CHANGELOG.md b/CHANGELOG.md
index f347c45a8..fc62ee566 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### 0.8.18
 **Bugfixes**
 - Fixed detector mode not persisting
+- Fixed bug where scrollbar didn't scroll correctly and thus hiding some items
 
 ### 0.8.17
 **Bugfixes**
diff --git a/src/main/java/refinedstorage/gui/GuiController.java b/src/main/java/refinedstorage/gui/GuiController.java
index a584cfa8d..3dbe8532d 100755
--- a/src/main/java/refinedstorage/gui/GuiController.java
+++ b/src/main/java/refinedstorage/gui/GuiController.java
@@ -34,8 +34,8 @@ public class GuiController extends GuiBase {
 
     @Override
     public void update(int x, int y) {
-        getScrollbar().setCanScroll(getRows() > VISIBLE_ROWS);
-        getScrollbar().setScrollDelta((float) getScrollbar().getScrollbarHeight() / (float) getRows());
+        getScrollbar().setEnabled(getRows() > VISIBLE_ROWS);
+        getScrollbar().setMaxOffset(getRows() - VISIBLE_ROWS);
     }
 
     @Override
@@ -57,7 +57,7 @@ public class GuiController extends GuiBase {
         int x = 33;
         int y = 26;
 
-        int slot = getOffset() * 2;
+        int slot = getScrollbar().getOffset() * 2;
 
         RenderHelper.enableGUIStandardItemLighting();
 
@@ -105,13 +105,7 @@ public class GuiController extends GuiBase {
         }
     }
 
-    private int getOffset() {
-        return (int) Math.ceil(getScrollbar().getCurrentScroll() / 59f * (float) getRows());
-    }
-
     private int getRows() {
-        int max = (int) Math.ceil((float) TileController.NODES.getValue().size() / (float) 2);
-
-        return max < 0 ? 0 : max;
+        return Math.max(0, (int) Math.ceil((float) TileController.NODES.getValue().size() / 2F));
     }
 }
diff --git a/src/main/java/refinedstorage/gui/GuiCraftingMonitor.java b/src/main/java/refinedstorage/gui/GuiCraftingMonitor.java
index 921ad6309..571558414 100755
--- a/src/main/java/refinedstorage/gui/GuiCraftingMonitor.java
+++ b/src/main/java/refinedstorage/gui/GuiCraftingMonitor.java
@@ -56,8 +56,8 @@ public class GuiCraftingMonitor extends GuiBase {
 
     @Override
     public void update(int x, int y) {
-        getScrollbar().setCanScroll(getRows() > VISIBLE_ROWS);
-        getScrollbar().setScrollDelta((float) getScrollbar().getScrollbarHeight() / (float) getRows());
+        getScrollbar().setEnabled(getRows() > VISIBLE_ROWS);
+        getScrollbar().setMaxOffset(getRows() - VISIBLE_ROWS);
 
         if (itemSelected >= getTasks().size()) {
             itemSelected = -1;
@@ -86,7 +86,7 @@ public class GuiCraftingMonitor extends GuiBase {
         int x = 8;
         int y = 20;
 
-        int item = getOffset() * 2;
+        int item = getScrollbar().getOffset() * 2;
 
         RenderHelper.enableGUIStandardItemLighting();
 
@@ -147,14 +147,8 @@ public class GuiCraftingMonitor extends GuiBase {
         }
     }
 
-    private int getOffset() {
-        return (int) Math.ceil(getScrollbar().getCurrentScroll() / 89f * (float) getRows());
-    }
-
     private int getRows() {
-        int max = (int) Math.ceil((float) getTasks().size() / (float) 2);
-
-        return max < 0 ? 0 : max;
+        return Math.max(0, (int) Math.ceil((float) getTasks().size() / (float) 2));
     }
 
     @Override
@@ -175,7 +169,7 @@ public class GuiCraftingMonitor extends GuiBase {
         if (mouseButton == 0 && inBounds(8, 20, 144, 90, mouseX - guiLeft, mouseY - guiTop)) {
             itemSelected = -1;
 
-            int item = getOffset() * 2;
+            int item = getScrollbar().getOffset() * 2;
 
             for (int y = 0; y < 3; ++y) {
                 for (int x = 0; x < 2; ++x) {
diff --git a/src/main/java/refinedstorage/gui/Scrollbar.java b/src/main/java/refinedstorage/gui/Scrollbar.java
index f1fed1e0c..b82fa0f87 100755
--- a/src/main/java/refinedstorage/gui/Scrollbar.java
+++ b/src/main/java/refinedstorage/gui/Scrollbar.java
@@ -3,80 +3,56 @@ package refinedstorage.gui;
 import org.lwjgl.input.Mouse;
 
 public class Scrollbar {
-    private boolean canScroll = true;
+    private static final int SCROLLER_HEIGHT = 15;
 
     private int x;
     private int y;
-    private int scrollbarWidth;
-    private int scrollbarHeight;
+    private int width;
+    private int height;
+    private boolean enabled = false;
 
-    private float scrollDelta = 15f;
+    private int offset;
+    private int maxOffset;
 
-    private float currentScroll;
     private boolean wasClicking = false;
     private boolean isScrolling = false;
 
-    public Scrollbar(int x, int y, int scrollbarWidth, int scrollbarHeight) {
+    public Scrollbar(int x, int y, int width, int height) {
         this.x = x;
         this.y = y;
-        this.scrollbarWidth = scrollbarWidth;
-        this.scrollbarHeight = scrollbarHeight;
+        this.width = width;
+        this.height = height;
     }
 
-    public int getScrollbarWidth() {
-        return scrollbarWidth;
+    public int getWidth() {
+        return width;
     }
 
-    public int getScrollbarHeight() {
-        return scrollbarHeight;
+    public int getHeight() {
+        return height;
     }
 
-    public void setCanScroll(boolean canScroll) {
-        this.canScroll = canScroll;
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
     }
 
-    public boolean canScroll() {
-        return canScroll;
-    }
-
-    public float getCurrentScroll() {
-        return currentScroll;
-    }
-
-    public void setCurrentScroll(float newCurrentScroll) {
-        if (newCurrentScroll < 0) {
-            newCurrentScroll = 0;
-        }
-
-        int scrollbarItselfHeight = 12;
-
-        int max = scrollbarHeight - scrollbarItselfHeight - 3;
-
-        if (newCurrentScroll > max) {
-            newCurrentScroll = max;
-        }
-
-        currentScroll = newCurrentScroll;
-    }
-
-    public void setScrollDelta(float delta) {
-        this.scrollDelta = delta;
+    public boolean isEnabled() {
+        return enabled;
     }
 
     public void draw(GuiBase gui) {
         gui.bindTexture("icons.png");
-        gui.drawTexture(gui.getGuiLeft() + x, gui.getGuiTop() + y + (int) currentScroll, canScroll() ? 232 : 244, 0, 12, 15);
+        gui.drawTexture(gui.getGuiLeft() + x, gui.getGuiTop() + y + (int) Math.min(height - SCROLLER_HEIGHT, (float) offset / (float) maxOffset * (float) (height - SCROLLER_HEIGHT)), isEnabled() ? 232 : 244, 0, 12, 15);
     }
 
     public void update(GuiBase gui, int mouseX, int mouseY) {
-        if (!canScroll()) {
+        if (!isEnabled()) {
             isScrolling = false;
             wasClicking = false;
-            currentScroll = 0;
         } else {
             boolean down = Mouse.isButtonDown(0);
 
-            if (!wasClicking && down && gui.inBounds(x, y, scrollbarWidth, scrollbarHeight, mouseX, mouseY)) {
+            if (!wasClicking && down && gui.inBounds(x, y, width, height, mouseX, mouseY)) {
                 isScrolling = true;
             }
 
@@ -87,20 +63,32 @@ public class Scrollbar {
             wasClicking = down;
 
             if (isScrolling) {
-                setCurrentScroll(mouseY - 20);
+                setOffset((int) Math.floor((float) (mouseY - SCROLLER_HEIGHT) / (float) (height - SCROLLER_HEIGHT) * (float) maxOffset));
             }
         }
     }
 
     public void wheel(int delta) {
-        if (canScroll()) {
-            delta = Math.max(Math.min(-delta, 1), -1);
+        if (isEnabled()) {
+            setOffset(offset + Math.max(Math.min(-delta, 1), -1));
+        }
+    }
 
-            if (delta == -1) {
-                setCurrentScroll(currentScroll - scrollDelta);
-            } else if (delta == 1) {
-                setCurrentScroll(currentScroll + scrollDelta);
-            }
+    public void setMaxOffset(int maxOffset) {
+        this.maxOffset = maxOffset;
+
+        if (offset > maxOffset) {
+            this.offset = Math.max(0, maxOffset);
+        }
+    }
+
+    public int getOffset() {
+        return offset;
+    }
+
+    public void setOffset(int offset) {
+        if (offset >= 0 && offset <= maxOffset) {
+            this.offset = offset;
         }
     }
 }
diff --git a/src/main/java/refinedstorage/gui/grid/GuiGrid.java b/src/main/java/refinedstorage/gui/grid/GuiGrid.java
index 2b9a94ffa..f1e8d2994 100755
--- a/src/main/java/refinedstorage/gui/grid/GuiGrid.java
+++ b/src/main/java/refinedstorage/gui/grid/GuiGrid.java
@@ -58,7 +58,6 @@ public class GuiGrid extends GuiBase {
         super(container, 227, (grid.getType() == EnumGridType.CRAFTING || grid.getType() == EnumGridType.PATTERN) ? 247 : 208);
 
         setScrollbar(new Scrollbar(174, 20, 12, (grid.getType() == EnumGridType.CRAFTING || grid.getType() == EnumGridType.PATTERN) ? 70 : 88));
-        getScrollbar().setCanScroll(false);
 
         this.container = container;
         this.grid = grid;
@@ -178,8 +177,8 @@ public class GuiGrid extends GuiBase {
 
         SORTED_ITEMS = sortedItems;
 
-        getScrollbar().setCanScroll(getRows() > getVisibleRows());
-        getScrollbar().setScrollDelta((float) getScrollbar().getScrollbarHeight() / (float) getRows());
+        getScrollbar().setEnabled(getRows() > getVisibleRows());
+        getScrollbar().setMaxOffset(getRows() - getVisibleRows());
     }
 
     @Override
@@ -191,14 +190,8 @@ public class GuiGrid extends GuiBase {
         }
     }
 
-    private int getOffset() {
-        return (int) Math.ceil(getScrollbar().getCurrentScroll() / 70f * (float) getRows());
-    }
-
     private int getRows() {
-        int max = (int) Math.ceil((float) SORTED_ITEMS.size() / 9f);
-
-        return max < 0 ? 0 : max;
+        return Math.max(0, (int) Math.ceil((float) SORTED_ITEMS.size() / 9F));
     }
 
     private boolean isOverSlotWithItem() {
@@ -271,7 +264,7 @@ public class GuiGrid extends GuiBase {
 
         this.slotNumber = -1;
 
-        int slot = getOffset() * 9;
+        int slot = getScrollbar().getOffset() * 9;
 
         RenderHelper.enableGUIStandardItemLighting();
 
diff --git a/src/main/java/refinedstorage/item/ItemStorageDisk.java b/src/main/java/refinedstorage/item/ItemStorageDisk.java
index 1558ee515..7decff81f 100755
--- a/src/main/java/refinedstorage/item/ItemStorageDisk.java
+++ b/src/main/java/refinedstorage/item/ItemStorageDisk.java
@@ -50,7 +50,7 @@ public class ItemStorageDisk extends ItemBase {
         super.onUpdate(stack, world, entity, slot, selected);
 
         if (!stack.hasTagCompound()) {
-            if (stack.getItemDamage() == 5) {
+            if (stack.getItemDamage() == TYPE_DEBUG) {
                 applyDebugDiskData(stack);
             } else {
                 NBTStorage.createStackWithNBT(stack);
diff --git a/src/main/java/refinedstorage/proxy/ClientProxy.java b/src/main/java/refinedstorage/proxy/ClientProxy.java
index 9d3428c90..7cc90afa6 100755
--- a/src/main/java/refinedstorage/proxy/ClientProxy.java
+++ b/src/main/java/refinedstorage/proxy/ClientProxy.java
@@ -189,7 +189,6 @@ public class ClientProxy extends CommonProxy {
         ModelLoader.setCustomModelResourceLocation(RefinedStorageItems.STORAGE_DISK, ItemStorageDisk.TYPE_16K, new ModelResourceLocation("refinedstorage:16k_storage_disk", "inventory"));
         ModelLoader.setCustomModelResourceLocation(RefinedStorageItems.STORAGE_DISK, ItemStorageDisk.TYPE_64K, new ModelResourceLocation("refinedstorage:64k_storage_disk", "inventory"));
         ModelLoader.setCustomModelResourceLocation(RefinedStorageItems.STORAGE_DISK, ItemStorageDisk.TYPE_CREATIVE, new ModelResourceLocation("refinedstorage:creative_storage_disk", "inventory"));
-        ModelLoader.setCustomModelResourceLocation(RefinedStorageItems.STORAGE_DISK, ItemStorageDisk.TYPE_DEBUG, new ModelResourceLocation("refinedstorage:debug_storage_disk", "inventory"));
 
         ModelLoader.setCustomModelResourceLocation(RefinedStorageItems.STORAGE_PART, ItemStoragePart.TYPE_1K, new ModelResourceLocation("refinedstorage:1k_storage_part", "inventory"));
         ModelLoader.setCustomModelResourceLocation(RefinedStorageItems.STORAGE_PART, ItemStoragePart.TYPE_4K, new ModelResourceLocation("refinedstorage:4k_storage_part", "inventory"));