SuperCard Pro
From Just Solve the File Format Problem
The SuperCard Pro[1] image file format will handle flux level images for any type of disk, be it 8", 5.25", 3.5", 3", GCR, FM, MFM, etc. It will also handle tape drives and hard drives that are MFM, RLL, or GCR encoded.
Format Information
SCP image files have a BOF header with BYTES 0x00-0x02 which contains the ASCII of "SCP" as the first 3 bytes.[2] BYTE 0x03 is the version/revision as a byte. Supported by the HxC Floppy Emulator software.[3] Hex template available from 010 editor.[4]