9 Oct
2024
9 Oct
'24
10:42 p.m.
On Wed, 9 Oct 2024, Wayne S via cctalk wrote:
My pleasure. Be aware that not all floppy disks were
written the same way. Regardless of different filesystems, there were different flux
encoding schemes too.
MOST are FM, MFM, or GCR.
But not all.
f'rinstance, Amiga is MFM, but does not use WD/IBM sector headers, so a
179x controller could read an Amiga track, but parsing sectors and file
system has to be done in software.
. . .and other variations, ranging from hard/soft sectors to CLV/CAV
(constant linear velocity (varying motor speed), constant Angular
velocity (fixed motor speed))
old floppies provide a neverending source of interesting stuff.
--
Grumpy Ol' Fred cisin(a)xenosoft.com