diff --git a/SecureDigital/CSD.cs b/SecureDigital/CSD.cs
index cc7e5cd0d..f40041156 100644
--- a/SecureDigital/CSD.cs
+++ b/SecureDigital/CSD.cs
@@ -359,7 +359,7 @@ namespace DiscImageChef.Decoders.SecureDigital
             else
             {
                 sb.AppendFormat("\tDevice has {0} blocks", (csd.Size + 1) * 1024).AppendLine();
-                result = (csd.Size + 1) * 1024 * 512;
+                result = ((ulong)csd.Size + 1) * 1024 * 512;
                 if(result > 1099511627776)
                     sb.AppendFormat("\tDevice has {0} TiB", result / 1099511627776.0).AppendLine();
                 else if(result > 1073741824)
diff --git a/SecureDigital/VendorString.cs b/SecureDigital/VendorString.cs
index 538fa7d99..14a65dbfb 100644
--- a/SecureDigital/VendorString.cs
+++ b/SecureDigital/VendorString.cs
@@ -40,6 +40,7 @@ namespace DiscImageChef.Decoders.SecureDigital
             {
                 case 0x02: return "Kingston";
                 case 0x03: return "Sandisk";
+                case 0x27: return "CnMemory";
                 case 0xAA: return "QEMU";
                 default:   return $"Unknown manufacturer ID 0x{sdVendorId:X2}";
             }