> > IBM started with Tandon TM100-2.
On 13 Oct 1998, Eric Smith wrote:
> No, with the IBM PC (model 5150), they started with the TM100-1, a 40 track
> single sided disk. In PC-DOS 1.0 they only used 8 sectors per track, for a
> total disk capacity of 160K.
Absolutely right! I stand corrected.
> In PC-DOS 1.1 they added support for the 9
> sector format, increasing the capacity to 180K.
> IIRC, the dual-sided drives were not available (from IBM) until the
> introduction of PC-DOS 2.0.
Actually, it was PC-DOS 1.10 (and MS-DOS 1.25) that provided DS, and 2.0
provided the 9SPT. Thus the 320K format came before the 180K/360K.
There were also unofficial patches for 1.00 to do DS, but using the
second side as if it were another drive.
> To this day, the MS-DOS format command still has options for single-sided
> and 8 SPT formats.
SHHHHH! Don't say anything or MS will take out that backward compatibility.
--
Fred Cisin cisin_at_xenosoft.com
XenoSoft http://www.xenosoft.com
2210 Sixth St. (510) 644-9366
Berkeley, CA 94710-2219
Received on Mon Oct 12 1998 - 20:54:45 BST