Inside your unit here are two switches:
one is close if disk is writable, the second is close if disk size is
720Kbytes.
If you floppy is older these switch can got some meccanical problems. Surely
your floppy has size dector switch locked.

> I have got a problem. I used my floppy disk drive to access 720kb
diskette.
> The system tried with difficulties to read that floppy and succeeded.
Since
> then the FDD has gone bad and I cannot access my HD floppy disk. Strange
> enough if I use the same 720kb diskette then the FDD reads it with
> difficulties, when I change to HD floppy the disk is not accessible.
>

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