diff --git a/DiscImageChef.DiscImages/DiskCopy42.cs b/DiscImageChef.DiscImages/DiskCopy42.cs
index c0901062..74d4adc4 100644
--- a/DiscImageChef.DiscImages/DiskCopy42.cs
+++ b/DiscImageChef.DiscImages/DiskCopy42.cs
@@ -793,7 +793,8 @@ namespace DiscImageChef.DiscImages
         public bool                IsWriting       { get; private set; }
         public string              ErrorMessage    { get; private set; }
 
-        public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors)
+        public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
+                           uint   sectorSize)
         {
             header      = new Dc42Header();
             bool tags   = false;
@@ -802,6 +803,12 @@ namespace DiscImageChef.DiscImages
             if(options != null && options.TryGetValue("macosx", out string tmpOption))
                 bool.TryParse(tmpOption, out macosx);
 
+            if(sectorSize != 512)
+            {
+                ErrorMessage = "Unsupported sector size";
+                return false;
+            }
+            
             switch(mediaType)
             {
                 case MediaType.AppleFileWare:
diff --git a/DiscImageChef.DiscImages/IWritableImage.cs b/DiscImageChef.DiscImages/IWritableImage.cs
index 332addb4..a461ccf0 100644
--- a/DiscImageChef.DiscImages/IWritableImage.cs
+++ b/DiscImageChef.DiscImages/IWritableImage.cs
@@ -65,7 +65,7 @@ namespace DiscImageChef.DiscImages
 
         bool IsWriting { get; }
         string ErrorMessage { get; }
-        
+
         /// <summary>
         ///     Creates a new image in the specified path, for the specified <see cref="MediaType" />, with the
         ///     specified options to hold a media with the specified number of sectors
@@ -74,8 +74,10 @@ namespace DiscImageChef.DiscImages
         /// <param name="mediaType"><see cref="MediaType" /> that will be written in the image</param>
         /// <param name="options">Options to be used when creating new image</param>
         /// <param name="sectors">How many sectors the media has.</param>
+        /// <param name="sectorSize"></param>
         /// <returns><c>true</c> if operating completed successfully, <c>false</c> otherwise</returns>
-        bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors);
+        bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
+                    uint   sectorSize);
 
         /// <summary>
         ///     Writes a media tag to the image
diff --git a/DiscImageChef/Commands/ConvertImage.cs b/DiscImageChef/Commands/ConvertImage.cs
index 65bd0ccd..748ab22c 100644
--- a/DiscImageChef/Commands/ConvertImage.cs
+++ b/DiscImageChef/Commands/ConvertImage.cs
@@ -192,7 +192,7 @@ namespace DiscImageChef.Commands
             }
 
             if(!outputFormat.Create(options.OutputFile, inputFormat.Info.MediaType, new Dictionary<string, string>(),
-                                    inputFormat.Info.Sectors))
+                                    inputFormat.Info.Sectors, inputFormat.Info.SectorSize))
             {
                 DicConsole.ErrorWriteLine("Error {0} creating output image.", outputFormat.ErrorMessage);
                 return;