А проверьте версию: данные на дискете записаны в формате файловой системы CP/M.
Вот сайт, где есть конвертеры форматов:
http://www.gaby.de/edownl.htm
Возможно, что-то из этого должно дать результат:
22DSK144.ZIP: 22DISK, version 1.44. Display and manipulate CP/M diskettes of many different systems (Shareware, will run in a Windows 9x DOS Box, but has got problems with 8" drives)
If you should ever experience incompatibilities with this version, here is a copy of version 1.42: 22DSK142.ZIP.
NEWDISKS.DEF: Some 22disk definitions from various sources, not contained in the 22disk packages (mostly for German/European machines). If you got any self-made definitions not contained in this file, please send them in.
22NCE132.ZIP: 22Nice, a small and fast CP/M 2.2 emulator for DOS
DISKINFO: Shows information about various diskette and drive formats, 02/13/02: New version 1.73.