diff --git a/DiscImageChef.CommonTypes/MediaType.cs b/DiscImageChef.CommonTypes/MediaType.cs
index b48170f41..da0e1023f 100644
--- a/DiscImageChef.CommonTypes/MediaType.cs
+++ b/DiscImageChef.CommonTypes/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/DiscImageChef.CommonTypes/MediaTypeFromSCSI.cs b/DiscImageChef.CommonTypes/MediaTypeFromSCSI.cs
index 6bb0bd004..cae1cb7c2 100644
--- a/DiscImageChef.CommonTypes/MediaTypeFromSCSI.cs
+++ b/DiscImageChef.CommonTypes/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:
diff --git a/DiscImageChef.DiscImages/CopyQM.cs b/DiscImageChef.DiscImages/CopyQM.cs
index 38544d70f..bab92af58 100644
--- a/DiscImageChef.DiscImages/CopyQM.cs
+++ b/DiscImageChef.DiscImages/CopyQM.cs
@@ -389,7 +389,7 @@ namespace DiscImageChef.ImagePlugins
                         ImageInfo.mediaType = MediaType.DOS_35_SS_DD_9;
                     else if(header.heads == 1 && header.imageCylinders == 80 && header.sectorsPerTrack == 8 && header.sectorSize == 512)
                         ImageInfo.mediaType = MediaType.DOS_35_SS_DD_8;
-                    else if(header.heads == 2 && header.imageCylinders == 80 && header.sectorsPerTrack == 10 && header.sectorSize == 512)
+                    else if(header.heads == 2 && header.imageCylinders == 80 && header.sectorsPerTrack == 5 && header.sectorSize == 1024)
                         ImageInfo.mediaType = MediaType.ACORN_35_DS_DD;
                     else if(header.heads == 2 && header.imageCylinders == 77 && header.sectorsPerTrack == 8 && header.sectorSize == 1024)
                         ImageInfo.mediaType = MediaType.SHARP_35;
diff --git a/DiscImageChef.DiscImages/ZZZRawImage.cs b/DiscImageChef.DiscImages/ZZZRawImage.cs
index 01df091cb..477fa0f77 100644
--- a/DiscImageChef.DiscImages/ZZZRawImage.cs
+++ b/DiscImageChef.DiscImages/ZZZRawImage.cs
@@ -130,6 +130,8 @@ namespace DiscImageChef.ImagePlugins
 			else if((extension == ".adf" || extension == ".adl" || extension == ".ssd" || extension == ".dsd") &&
 			        (imageFilter.GetDataForkLength() == 163840 || imageFilter.GetDataForkLength() == 327680 || imageFilter.GetDataForkLength() == 655360))
 				ImageInfo.sectorSize = 256;
+			else if((extension == ".adf" || extension == ".adl") && imageFilter.GetDataForkLength() == 819200)
+				ImageInfo.sectorSize = 1024;
 			else
 			{
 				switch(imageFilter.GetDataForkLength())
@@ -680,7 +682,7 @@ namespace DiscImageChef.ImagePlugins
                     case 819200:
 						if(ImageInfo.sectorSize == 256)
 							return MediaType.CBM_35_DD;
-						if(extension == ".adf" || extension == ".adl")
+						if((extension == ".adf" || extension == ".adl") && ImageInfo.sectorSize == 1024)
 							return MediaType.ACORN_35_DS_DD;
 						if(extension == ".st")
 							return MediaType.ATARI_35_DS_DD;