diff --git a/DiscImageChef.Core/Devices/Dumping/ATA.cs b/DiscImageChef.Core/Devices/Dumping/ATA.cs
index b9204074..52e18cbb 100644
--- a/DiscImageChef.Core/Devices/Dumping/ATA.cs
+++ b/DiscImageChef.Core/Devices/Dumping/ATA.cs
@@ -241,7 +241,8 @@ namespace DiscImageChef.Core.Devices.Dumping
                         }
                         else
                         {
-                            unreadableSectors.Add(i);
+                            for(ulong b = i; b < i + blocksToRead; b++)
+                                unreadableSectors.Add(b);
                             if(duration < 500)
                                 mhddLog.Write(i, 65535);
                             else
diff --git a/DiscImageChef.Core/Devices/Dumping/CompactDisc.cs b/DiscImageChef.Core/Devices/Dumping/CompactDisc.cs
index 9e0b9add..a48b8723 100644
--- a/DiscImageChef.Core/Devices/Dumping/CompactDisc.cs
+++ b/DiscImageChef.Core/Devices/Dumping/CompactDisc.cs
@@ -570,7 +570,8 @@ namespace DiscImageChef.Core.Devices.Dumping
                         // TODO: Record error on mapfile
 
                         errored += blocksToRead;
-                        unreadableSectors.Add(i);
+                        for(ulong b = i; b < i + blocksToRead; b++)
+                            unreadableSectors.Add(b);
                         DicConsole.DebugWriteLine("Dump-Media", "READ error:\n{0}", Decoders.SCSI.Sense.PrettifySense(senseBuf));
                         if(cmdDuration < 500)
                             mhddLog.Write(i, 65535);
diff --git a/DiscImageChef.Core/Devices/Dumping/SBC.cs b/DiscImageChef.Core/Devices/Dumping/SBC.cs
index 00c31e2e..903e6489 100644
--- a/DiscImageChef.Core/Devices/Dumping/SBC.cs
+++ b/DiscImageChef.Core/Devices/Dumping/SBC.cs
@@ -353,7 +353,8 @@ namespace DiscImageChef.Core.Devices.Dumping
                     // TODO: Record error on mapfile
 
                     errored += blocksToRead;
-                    unreadableSectors.Add(i);
+                    for(ulong b = i; b < i + blocksToRead; b++)
+                        unreadableSectors.Add(b);
                     if(cmdDuration < 500)
                         mhddLog.Write(i, 65535);
                     else
diff --git a/DiscImageChef.Core/Devices/Dumping/XGD.cs b/DiscImageChef.Core/Devices/Dumping/XGD.cs
index 9669e4cb..72147b89 100644
--- a/DiscImageChef.Core/Devices/Dumping/XGD.cs
+++ b/DiscImageChef.Core/Devices/Dumping/XGD.cs
@@ -283,7 +283,8 @@ namespace DiscImageChef.Core.Devices.Dumping
                         // TODO: Record error on mapfile
 
                         errored += blocksToRead;
-                        unreadableSectors.Add(i);
+                        for(ulong b = i; b < i + blocksToRead; b++)
+                            unreadableSectors.Add(b);
                         DicConsole.DebugWriteLine("Dump-Media", "READ error:\n{0}", Decoders.SCSI.Sense.PrettifySense(senseBuf));
                         if(cmdDuration < 500)
                             mhddLog.Write(i, 65535);
diff --git a/DiscImageChef.Core/Devices/Scanning/ATA.cs b/DiscImageChef.Core/Devices/Scanning/ATA.cs
index e370be69..ef92d22e 100644
--- a/DiscImageChef.Core/Devices/Scanning/ATA.cs
+++ b/DiscImageChef.Core/Devices/Scanning/ATA.cs
@@ -185,7 +185,8 @@ namespace DiscImageChef.Core.Devices.Scanning
                         else
                         {
                             results.errored += blocksToRead;
-                            results.unreadableSectors.Add(i);
+                            for(ulong b = i; b < i + blocksToRead; b++)
+                                results.unreadableSectors.Add(b);
                             if(duration < 500)
                                 mhddLog.Write(i, 65535);
                             else
diff --git a/DiscImageChef.Core/Devices/Scanning/SCSI.cs b/DiscImageChef.Core/Devices/Scanning/SCSI.cs
index b5103a0a..c742e9ff 100644
--- a/DiscImageChef.Core/Devices/Scanning/SCSI.cs
+++ b/DiscImageChef.Core/Devices/Scanning/SCSI.cs
@@ -342,7 +342,8 @@ namespace DiscImageChef.Core.Devices.Scanning
                                 (senseDecoded.Value.ASC != 0x64 || senseDecoded.Value.ASCQ != 0x00))
                             {
                                 results.errored += blocksToRead;
-                                results.unreadableSectors.Add(i);
+                                for(ulong b = i; b < i + blocksToRead; b++)
+                                    results.unreadableSectors.Add(b);
                                 if(cmdDuration < 500)
                                     mhddLog.Write(i, 65535);
                                 else
@@ -354,7 +355,8 @@ namespace DiscImageChef.Core.Devices.Scanning
                         else
                         {
                             results.errored += blocksToRead;
-                            results.unreadableSectors.Add(i);
+                            for(ulong b = i; b < i + blocksToRead; b++)
+                                results.unreadableSectors.Add(b);
                             if(cmdDuration < 500)
                                 mhddLog.Write(i, 65535);
                             else
@@ -429,7 +431,8 @@ namespace DiscImageChef.Core.Devices.Scanning
                     else
                     {
                         results.errored += blocksToRead;
-                        results.unreadableSectors.Add(i);
+                        for(ulong b = i; b < i + blocksToRead; b++)
+                            results.unreadableSectors.Add(b);
                         if(cmdDuration < 500)
                             mhddLog.Write(i, 65535);
                         else