On Jan 21, 16:58, Sam Ismail wrote:
> Subject: Re: Reiability of wrong media (was: is out of 5-1/4" diskettes
> On Fri, 22 Jan 1999, Pete Turnbull wrote:
>
> > "OK, so that's a flippy", I said to myself. A little later, I re-read
the
> > catalogue -- and got a different listing! I had inadvertantly
catalogued
> > side two, with the disk right-side-up -- and realised that the tracks
must
> > not line up, so side two had two sets of data, going in opposite
rotations,
> > with the tracks interleaved!
>
> This can't be possible! Otherwise, why didn't someone exploit this to
> make 4-sided diskettes??
It was an 80-track drive, but the disk was formatted to 40 tracks
originally -- there just happened to be two sets of 40 on one of the sides.
The second set was probably recorded on a double-stepped 80-track drive,
so the track width was only half as wide as a real 40-track would have
written, and becuse of the offset between upper and lower heads, just
happened to fall in the right place.
It would be an awfully complicated way to get 80 tracks out of an 80 track
drive :-)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Received on Thu Jan 21 1999 - 20:01:32 GMT