Re: CBM-900 floppy disk format/encoding

From: Greg King <*greg.king4_at_verizon.net*> Date: Sat, 22 Oct 2011 05:02:20 -0400 Message-id: <002701cc9099$57690c40$443efea9@monarch> · greg.king4_at_verizon.net

From: "William Levak"; on Sat., October 22, 2011; at 01:11 AM -0400
>

> On Fri, 21 Oct 2011, Ed Johnson wrote:
>
> > I have a SFD 1001 and it used DS/DD diskettes, NOT HD (High Density)
> > diskettes.
>
> The drive mechanism on the SFD 1001 is a Quad Density drive,
> compatible with DD, but not HD.

"Quad" was a marketting gimmick.  It wasn't related to single- and
double-density.  It meant that the track density, not the bit density,
was "doubled".

The 4040 format is 48 Tracks Per Inch, while the 8050 format is 100 TPI.

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