Bill Yakowenko wrote:
>
> Hey, with the discussion of diskettes recently, and my own
> search for info on RX50's, I was a little surprised by the
> lack of available info on single-sided single-density 5.25"
> floppy disks (emphasis on SD). Were they ever actually
> manufactured, or was SS/SD strictly an 8" thing? I seem to
> remember seeing SS/SD 5.25" way back when. Can anybody
> give me an authoritative rating of their coercivity? Were
> they 300 Oerstedts, just like DD? If so, what is it that
> made them single density? Something about the size of the
> individual magnetic domains maybe? Or were exactly the same
> diskettes called "double density" when we figured out how
> to make drives to handle that?
Farzino, the Oersted value of SSSD (90k), DSSD (180k), SSDD (180k)
and DSDD (360k) 5.25" diskettes was the same. For that matter, it
was the same with QD (720k) diskettes. Manufacturers "tested" and
rated the media for different densities, and I know that some disks
that worked fine as SSSD failed miserable in the Tandy 2000 (720k)
while others worked just peachy. I don't know of any failures
involving using a higher-rated floppy in a lower drive except when
the media had been previously used in a 720k drive. When you get
to the official HD, 1.2Mb media, the situation changes.
--
Ward Griffiths wdg3rd_at_home.com <http://members.home.net/wdg3rd>
WARNING: The Attorney General has determined that Alcohol, Tobacco,
and Firearms can be hazardous to your health -- and get away with it.
Received on Sun Oct 03 1999 - 15:56:03 BST