On Wed, 9 Aug 2017, Mike Stein via cctalk wrote:
Interesting reading here under disk formats:
https://en.wikipedia.org/wiki/86-DOS
Sounds like there were two Tarbell controllers, single and double density but both single-sided ?
Also sounds like the FAT12 disk formats were not quite MS-DOS compatible...


There are also, of course MANY MS-DOS formats that are not PC-DOS compatible, nor compatible with "modern" MS-DOS.

Some are hardware incompatible, such as Sirius/Victor 9000.

Some are not recognized by "modern" MS-DOS, but nevertheless are straight-forward to read/write with IMD, XenoCopy, 22Disk, etc. Those range from ones with different sector sizes, to ones that are ALMOST PC-DOS, but with different number of DIRectory sectors, etc.
HP
Atari ST
Gavilan
Canon
NEC
etc.

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