=== IBM format ===
The IBM format is only usable on the earliest early IBM PCs as it uses 8 sectors per track and the CP/M filesystem. This was the format used in MS-DOS 1.x. [https://www.os2museum.com/wp/dos/dos-1-0-and-1-1/ Source]
With MS-DOS 2.0 (1983), PC floppies switched to 9 sectors per track and the FAT12 filesystem. [https://minuszerodegrees.net/5150/early/5150_early.htm Source]