1 files changed, 3 insertions, 2 deletions

diff --git a/FdsFile.cs b/FdsFile.cs
index 01e3a68..e374f82 100644
--- a/FdsFile.cs
+++ b/FdsFile.cs
@@ -26,7 +26,7 @@ namespace com.clusterrr.Famicom.Containers
 

         public FdsFile(byte[] data) : this()

         {

-            if (data[0] == (byte)'F' && data[1] == (byte)'D' && data[2] == (byte)'S')

+            if (data[0] == (byte)'F' && data[1] == (byte)'D' && data[2] == (byte)'S' && data[3] == 0x1A)

                 data = data.Skip(16).ToArray(); // skip header

             for (int i = 0; i < data.Length; i += 65500)

             {

@@ -54,7 +54,8 @@ namespace com.clusterrr.Famicom.Containers
                 header[0] = (byte)'F';

                 header[1] = (byte)'D';

                 header[2] = (byte)'S';

-                header[3] = (byte)sides.Count();

+                header[3] = 0x1A;

+                header[4] = (byte)sides.Count();

                 data = Enumerable.Concat(header, data);

             }

             return data.ToArray();