IMHO, the best sector editor and block editor for your needs (which reads any size disk and any format) can be downloaded from this url: ftp://apple.cabi.net/pub/ground/Collections/1WSW/BWORK.SHK You can even download the src. code for it. ftp://apple.cabi.net/pub/ground/Collections/1WSW/BW.src.SHK Enjoy & Cheers, Tom