diff --git a/DiscImageChef.Devices/Device/AtaCommands/AtaCHS.cs b/DiscImageChef.Devices/Device/AtaCommands/AtaCHS.cs
index ef1e956e5..78bad7735 100644
--- a/DiscImageChef.Devices/Device/AtaCommands/AtaCHS.cs
+++ b/DiscImageChef.Devices/Device/AtaCommands/AtaCHS.cs
@@ -202,9 +202,9 @@ namespace DiscImageChef.Devices
             bool sense;
 
             if(retry)
-                registers.command = (byte)AtaCommands.ReadLong;
-            else
                 registers.command = (byte)AtaCommands.ReadLongRetry;
+            else
+                registers.command = (byte)AtaCommands.ReadLong;
             registers.sectorCount = 1;
             registers.cylinderHigh = (byte)((cylinder & 0xFF00) / 0x100);
             registers.cylinderLow = (byte)((cylinder & 0xFF) / 0x1);
diff --git a/DiscImageChef.Devices/Device/ScsiCommands/MMC.cs b/DiscImageChef.Devices/Device/ScsiCommands/MMC.cs
index 19c6a7271..c70ff8cff 100644
--- a/DiscImageChef.Devices/Device/ScsiCommands/MMC.cs
+++ b/DiscImageChef.Devices/Device/ScsiCommands/MMC.cs
@@ -292,7 +292,7 @@ namespace DiscImageChef.Devices
             byte[] tmpBuffer;
             bool sense;
 
-            if(format == 5)
+            if((format & 0x0F)== 5)
                 tmpBuffer = new byte[32768];
             else
                 tmpBuffer = new byte[1024];
diff --git a/DiscImageChef.Devices/Device/ScsiCommands/Pioneer.cs b/DiscImageChef.Devices/Device/ScsiCommands/Pioneer.cs
index 580e939a3..de9ea0323 100644
--- a/DiscImageChef.Devices/Device/ScsiCommands/Pioneer.cs
+++ b/DiscImageChef.Devices/Device/ScsiCommands/Pioneer.cs
@@ -92,7 +92,7 @@ namespace DiscImageChef.Devices
             byte[] cdb = new byte[12];
             bool sense;
 
-            cdb[0] = (byte)ScsiCommands.ReadCdMsf;
+            cdb[0] = (byte)ScsiCommands.ReadCdDaMsf;
             cdb[3] = (byte)((startMsf & 0xFF0000) >> 16);
             cdb[4] = (byte)((startMsf & 0xFF00) >> 8);
             cdb[5] = (byte)(startMsf & 0xFF);