This matter make me think in the problem with the 1.44 Mb floppies
we have from 1993 to this date. In that time you could purchase 720k
floppies and format it like 1.44Mb floppies without problem. And, even
more important, read one 720K floppie formated like one of 1.44Mb.
This was valid until the IBM PS VP. This was the last. If I remember
it correctly, all the models of floppies of PCs' began to fail in the
management of this floppies on this date. Bad matter, because I already
have a lot of them with BBS stuff and Clipper libraries from these years
that I can access only with one IBM PS/2 70 that I have in the garage.
Cheers
Sergio