Originally Posted by
gfunkdave
I've tried running MacDisk and it says it can't find the Macintosh volume header. Windows 10 says it's not a valid disk. I am 100% sure that I would have used a Mac to create the disk...my trusty old Mac IIsi running System 7 or System 8.
I think you need a Mac of that era. IIRC, Macs wrote data on FD differently than MS-DOS machines of that day (when Windows ran over MS-DOS). Macs could read and write MS-DOS format FDs but not the other way around.
https://fletcherpenney.net/2018/02/r...c_floppy_disks
https://lowendmac.com/2016/floppy-di...the-mac-world/
Find an old school MUG perhaps?