diff --git a/DiscImageChef.Gui/Controls/BlockMap.cs b/DiscImageChef.Gui/Controls/BlockMap.cs
new file mode 100644
index 000000000..09c3e669c
--- /dev/null
+++ b/DiscImageChef.Gui/Controls/BlockMap.cs
@@ -0,0 +1,115 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.Linq;
+
+namespace DiscImageChef.Gui.Controls
+{
+    public class BlockMap : ColoredGrid
+    {
+        ulong       _sectors;
+        public uint blocksToRead;
+
+        public uint sectorsToRead;
+
+        public BlockMap()
+        {
+            ColoredSectors                   =  new ObservableCollection<ColoredBlock>();
+            ColoredSectors.CollectionChanged += OnColoredSectorsChanged;
+        }
+
+        public ulong Sectors
+        {
+            get => _sectors;
+            set
+            {
+                _sectors = value;
+                CalculateBoundaries();
+                Invalidate();
+            }
+        }
+
+        public ulong SectorsPerBlock { get; private set; }
+
+        public uint SectorsToRead
+        {
+            get => sectorsToRead;
+            set
+            {
+                sectorsToRead = value;
+                blocksToRead  = (uint)(sectorsToRead / SectorsPerBlock);
+                if(sectorsToRead % SectorsPerBlock > 0) blocksToRead++;
+            }
+        }
+
+        public ObservableCollection<ColoredBlock> ColoredSectors { get; }
+
+        void OnColoredSectorsChanged(object sender, NotifyCollectionChangedEventArgs args)
+        {
+            switch(args.Action)
+            {
+                case NotifyCollectionChangedAction.Add:
+                    foreach(object item in args.NewItems)
+                    {
+                        if(!(item is ColoredBlock block)) continue;
+
+                        for(ulong i = 0; i < blocksToRead; i++)
+                            ColoredBlocks.Add(new ColoredBlock(block.Block / SectorsPerBlock + i, block.Color));
+                    }
+
+                    break;
+                case NotifyCollectionChangedAction.Move: break;
+                case NotifyCollectionChangedAction.Remove:
+                    foreach(object item in args.OldItems)
+                    {
+                        if(!(item is ColoredBlock block)) continue;
+
+                        for(ulong i = 0; i < blocksToRead; i++)
+                            ColoredBlocks.Remove(ColoredBlocks.FirstOrDefault(t => t.Block == block.Block /
+                                                                                   SectorsPerBlock + i));
+                    }
+
+                    break;
+                case NotifyCollectionChangedAction.Replace:
+                    foreach(object item in args.OldItems)
+                    {
+                        if(!(item is ColoredBlock block)) continue;
+
+                        for(ulong i = 0; i < blocksToRead; i++)
+                            ColoredBlocks.Remove(ColoredBlocks.FirstOrDefault(t => t.Block == block.Block /
+                                                                                   SectorsPerBlock + i));
+                    }
+
+                    foreach(object item in args.NewItems)
+                    {
+                        if(!(item is ColoredBlock block)) continue;
+
+                        for(ulong i = 0; i < blocksToRead; i++)
+                            ColoredBlocks.Add(new ColoredBlock(block.Block / SectorsPerBlock + i, block.Color));
+                    }
+
+                    break;
+                case NotifyCollectionChangedAction.Reset:
+                    ColoredBlocks.Clear();
+                    break;
+                default: throw new ArgumentOutOfRangeException();
+            }
+        }
+
+        void CalculateBoundaries()
+        {
+            SectorsPerBlock = Blocks == 0 ? 0 : _sectors / Blocks;
+            ColoredBlocks.Clear();
+
+            if(SectorsPerBlock > 0) return;
+
+            SectorsPerBlock = 1;
+            for(ulong i = Sectors; i < Blocks; i++) ColoredBlocks.Add(new ColoredBlock(i, GridColor));
+        }
+
+        public void Clear()
+        {
+            ColoredSectors.Clear();
+        }
+    }
+}
\ No newline at end of file
diff --git a/DiscImageChef.Gui/Controls/ColoredGrid.cs b/DiscImageChef.Gui/Controls/ColoredGrid.cs
index 48dbe007c..005866ef4 100644
--- a/DiscImageChef.Gui/Controls/ColoredGrid.cs
+++ b/DiscImageChef.Gui/Controls/ColoredGrid.cs
@@ -14,10 +14,13 @@ namespace DiscImageChef.Gui.Controls
         /// </summary>
         const int BLOCK_SIZE = 5;
 
+        Color gridColor;
+
         public ColoredGrid()
         {
             ColoredBlocks                   =  new ObservableCollection<ColoredBlock>();
             ColoredBlocks.CollectionChanged += (sender, args) => Invalidate();
+            gridColor                       =  Colors.Black;
         }
 
         new bool CanFocus => false;
@@ -32,7 +35,18 @@ namespace DiscImageChef.Gui.Controls
         /// <summary>
         ///     How many blocks are in the grid
         /// </summary>
-        public int Blocks { get; private set; }
+        public ulong Blocks { get; private set; }
+        public Color GridColor
+        {
+            get => gridColor;
+            set
+            {
+                if(gridColor == value) return;
+
+                gridColor = value;
+                Invalidate();
+            }
+        }
 
         public ObservableCollection<ColoredBlock> ColoredBlocks { get; }
 
@@ -48,28 +62,26 @@ namespace DiscImageChef.Gui.Controls
             remainder = (int)rect.Height % (BLOCK_SIZE  + 1);
             int height = (int)rect.Height - remainder   - 1;
 
-            for(float i = rect.X; i <= width; i += 5)
-                graphics.DrawLine(Color.FromRgb(0x00000000), i, rect.Y, i, height);
+            for(float i = rect.X; i <= width; i += 5) graphics.DrawLine(gridColor, i, rect.Y, i, height);
 
-            for(float i = rect.Y; i <= height; i += 5)
-                graphics.DrawLine(Color.FromRgb(0x00000000), rect.X, i, width, i);
+            for(float i = rect.Y; i <= height; i += 5) graphics.DrawLine(gridColor, rect.X, i, width, i);
 
-            Columns = width   / BLOCK_SIZE;
-            Rows    = height  / BLOCK_SIZE;
-            Blocks  = Columns * Rows;
+            Columns = width  / BLOCK_SIZE;
+            Rows    = height / BLOCK_SIZE;
+            Blocks  = (ulong)(Columns * Rows);
 
             foreach(ColoredBlock coloredBlock in ColoredBlocks)
                 PaintBlock(graphics, coloredBlock.Color, coloredBlock.Block);
         }
 
-        void PaintBlock(Graphics graphics, Color color, int block)
+        void PaintBlock(Graphics graphics, Color color, ulong block)
         {
             if(block > Blocks) return;
 
-            int row = block / Columns;
-            int col = block % Columns;
-            int x   = col   * BLOCK_SIZE;
-            int y   = row   * BLOCK_SIZE;
+            int row = (int)(block / (ulong)Columns);
+            int col = (int)(block % (ulong)Columns);
+            int x   = col * BLOCK_SIZE;
+            int y   = row * BLOCK_SIZE;
 
             graphics.FillRectangle(color, x + 1, y + 1, BLOCK_SIZE - 1, BLOCK_SIZE - 1);
         }
@@ -80,10 +92,10 @@ namespace DiscImageChef.Gui.Controls
     /// </summary>
     public class ColoredBlock
     {
-        public readonly int   Block;
+        public readonly ulong Block;
         public readonly Color Color;
 
-        public ColoredBlock(int block, Color color)
+        public ColoredBlock(ulong block, Color color)
         {
             Block = block;
             Color = color;