diff --git a/DiscImageChef.CommonTypes/MediaType.cs b/DiscImageChef.CommonTypes/MediaType.cs
index e5d4af078..c83fd0407 100644
--- a/DiscImageChef.CommonTypes/MediaType.cs
+++ b/DiscImageChef.CommonTypes/MediaType.cs
@@ -374,14 +374,14 @@ namespace DiscImageChef.CommonTypes
         #endregion Commodore standard floppy formats
 
         #region NEC standard floppy formats
-        /// <summary>8", SS, SD, 77 tracks, 26 spt, 128 bytes/sector, FM</summary>
+        /// <summary>8", DS, SD, 77 tracks, 26 spt, 128 bytes/sector, FM</summary>
         NEC_8_SD,
-        /// <summary>8", DS, DD, 77 tracks, 8 spt, 1024 bytes/sector, MFM</summary>
+        /// <summary>8", DS, DD, 77 tracks, 26 spt, 256 bytes/sector, MFM</summary>
         NEC_8_DD,
-        /// <summary>8", SS, SD, 77 tracks, 26 spt, 128 bytes/sector, FM</summary>
-        NEC_525_SD,
-        /// <summary>8", SS, SD, 77 tracks, 26 spt, 256 bytes/sector, MFM?</summary>
-        NEC_525_DD,
+        /// <summary>5.25", SS, SD, 80 tracks, 16 spt, 256 bytes/sector, FM</summary>
+        NEC_525_SS,
+        /// <summary>5.25", DS, SD, 80 tracks, 16 spt, 256 bytes/sector, MFM</summary>
+        NEC_525_DS,
         /// <summary>5,25", DS, HD, 77 tracks, 8 spt, 1024 bytes/sector, MFM</summary>
         NEC_525_HD,
         /// <summary>3,5", DS, HD, 77 tracks, 8 spt, 1024 bytes/sector, MFM, aka mode 3</summary>
diff --git a/DiscImageChef.DiscImages/DIM.cs b/DiscImageChef.DiscImages/DIM.cs
index c7ddb7022..b11eadf6b 100644
--- a/DiscImageChef.DiscImages/DIM.cs
+++ b/DiscImageChef.DiscImages/DIM.cs
@@ -205,13 +205,13 @@ namespace DiscImageChef.ImagePlugins
                     if(diskSize % (2 * 26 * 256) == 0)
                     {
                         if(diskSize % (2 * 26 * 256) == 77)
-                            ImageInfo.mediaType = MediaType.NEC_525_DD;
+                            ImageInfo.mediaType = MediaType.NEC_8_DD;
                         ImageInfo.sectorSize = 256;
                     }
                     else if(diskSize % (2 * 26 * 128) == 0)
                     {
                         if(diskSize % (2 * 26 * 128) == 77)
-                            ImageInfo.mediaType = MediaType.NEC_525_SD;
+                            ImageInfo.mediaType = MediaType.NEC_8_SD;
                         ImageInfo.sectorSize = 256;
                     }
                     else
diff --git a/DiscImageChef.DiscImages/ZZZRawImage.cs b/DiscImageChef.DiscImages/ZZZRawImage.cs
index 56b56dfc7..c795f7e10 100644
--- a/DiscImageChef.DiscImages/ZZZRawImage.cs
+++ b/DiscImageChef.DiscImages/ZZZRawImage.cs
@@ -709,9 +709,7 @@ namespace DiscImageChef.ImagePlugins
                     case 1255168:
                         return MediaType.ECMA_69_8;
                     case 1261568:
-						if(extension == ".hdm")
-							return MediaType.NEC_525_HD;
-						return MediaType.NEC_8_DD;
+						return MediaType.NEC_525_HD;
 					case 1304320:
                         return MediaType.ECMA_99_8;
                     case 1427456: