From: Anders Carlsson (anders.carlsson_at_sfks.se)
Date: 2006-12-29 09:11:05
On Fri 2006-12-29 06:00, William Levak wrote:
> Quad Density and High Density are both 96 tpi.
The biggest question is whether any floppy disk manufacturer ever
sold 5.25" floppy disks labeled QD, or if it is a designation
invented by the users. Up to now, the handful brands I've seen
are labeled 96 tpi DD or something similar (or 100 tpi in case
of PET-DISK).
By the way, the mechanism in 8050/8250 and I suppose SFD-1001 is
referred to as a 100 tpi drive that formats 77 tracks. Sometimes
it is said that only true 100 tpi floppies are known to work 100%
in those drives, and that a 96 tpi DD floppy probably is a better
substitute than a 48 tpi DD but not all the way. Is this true, and
did any other brand than Commodore/PET themselves label their
floppies as 100/77 tpi?
(Hmm.. cross-list posting by William. Is that desired?)
--
Anders Carlsson
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