diff --git a/MediaType.cs b/MediaType.cs
index b48170f..da0e102 100644
--- a/MediaType.cs
+++ b/MediaType.cs
@@ -331,7 +331,7 @@ namespace DiscImageChef.CommonTypes
         ACORN_525_SS_DD_80,
         /// <summary>5,25", DS, DD, 80 tracks, 16 spt, 256 bytes/sector, MFM</summary>
         ACORN_525_DS_DD,
-        /// <summary>3,5", DS, DD, 80 tracks, 10 spt, 512 bytes/sector, MFM</summary>
+        /// <summary>3,5", DS, DD, 80 tracks, 5 spt, 1024 bytes/sector, MFM</summary>
         ACORN_35_DS_DD,
         /// <summary>3,5", DS, HD, 80 tracks, 10 spt, 1024 bytes/sector, MFM</summary>
         ACORN_35_DS_HD,
diff --git a/MediaTypeFromSCSI.cs b/MediaTypeFromSCSI.cs
index 6bb0bd0..cae1cb7c 100644
--- a/MediaTypeFromSCSI.cs
+++ b/MediaTypeFromSCSI.cs
@@ -325,8 +325,6 @@ namespace DiscImageChef.CommonTypes
                                                 return MediaType.DOS_35_DS_DD_8;
                                             case 1440:
                                                 return MediaType.ECMA_100;
-                                            case 1600:
-                                                return MediaType.ACORN_35_DS_DD;
                                             case 1640:
                                                 return MediaType.FDFORMAT_35_DD;
                                             case 1760:
@@ -374,6 +372,10 @@ namespace DiscImageChef.CommonTypes
                                     case 1024:
                                         switch(blocks)
                                         {
+                                            case 800:
+                                                return MediaType.ACORN_35_DS_DD;
+                                            case 1600:
+                                                return MediaType.ACORN_35_DS_HD;
                                             case 1220:
                                                 return MediaType.IBM53FD_1024;
                                             case 1232: