Joined: 23-June 03
Member No.: 45307
Xbox Version: v1.1
360 version: none
Or, it might be because you're using XCommander...
I've found that some SNES and Mega Drive ROMs won't copy from disc to the HD with XCommander - even thoght they have short names and valid characters. I don't know what the problem is there, but since using XToolBox to do my transferring, I've had no problems.