diff --git a/DiscImageChef.Core/Devices/Dumping/SecureDigital.cs b/DiscImageChef.Core/Devices/Dumping/SecureDigital.cs
index f1ae5da3..326ccbf8 100644
--- a/DiscImageChef.Core/Devices/Dumping/SecureDigital.cs
+++ b/DiscImageChef.Core/Devices/Dumping/SecureDigital.cs
@@ -84,7 +84,7 @@ namespace DiscImageChef.Core.Devices.Dumping
 
             sidecar.BlockMedia[0].SecureDigital = new SecureDigitalType();
 
-            uint blocksToRead = 256;
+            uint blocksToRead = 1;
             uint blockSize = 512;
             ulong blocks = 0;
             byte[] cid = null;
diff --git a/DiscImageChef.Core/Devices/Scanning/SecureDigital.cs b/DiscImageChef.Core/Devices/Scanning/SecureDigital.cs
index 084278e9..fd79162b 100644
--- a/DiscImageChef.Core/Devices/Scanning/SecureDigital.cs
+++ b/DiscImageChef.Core/Devices/Scanning/SecureDigital.cs
@@ -59,7 +59,7 @@ namespace DiscImageChef.Core.Devices.Scanning
             uint timeout = 5;
             double duration = 0;
             ushort currentProfile = 0x0001;
-            uint blocksToRead = 256;
+            uint blocksToRead = 1;
             uint blockSize = 512;
 
             if(dev.Type == DeviceType.MMC)