#: 16342 S12/OS9/68000 (OSK)
    30-Aug-92  09:00:04
Sb: #16339-New drives
Fm: Jay Truesdale 72176,3565
To: Bob van der Poel 76510,2203 (X)

Your theory about another hole on the disk to indicate ED (extended density)
mode is correct. The disk media surface is different from that used in the 1.44
media and is currently expensive (remember that it was the same way when 1.44
drives were new). The number of sectors per track (on a PC) is doubled from 18
to 36.

These drives will work in a PC but the controller must be able to specifically
support the 1000 KB data rate required by the ED drive for the 2.88 media, most
PC controllers do not support the 2.88 drives. Dalco (see computer shopper) and
other vendors sell PC controller capable of using the 2.88 drives. The lower
density media are usable in the 2.88 drives at their lower capacity. MS-DOS
V5.0 properly supports the 2.88 drives if the PC floppy controller does.

Sooo, if the MM/1 floppy disk controller supports the 1000 kb data rate then
the drives should be usable on the MM/1.

-J