Sharp MZ-80B boot disk

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Thu Dec 19 21:19:01 2002

> >> IBM PS/2's usually read and write low-density disks high-density.
> > The lack of a "media density sensor" is inexcusable.

On Thu, 19 Dec 2002, John Allain wrote:
> Since both Fred and Van/Sridhar/ce checked in on this one I probably
> should shut up, but ISTR that Backup, for one, could & would check the
> dens. on the 1st disk in a set, but also could be caught Not looking for
> any Nth (N>1) disk in the set, if it was mismatched. But it wasn't like it
> couldn't check At All... (machine=PS2m60) My $0.02...

The problem that we were referring to was due to the physical absence of
hardware to check for a media density hole. What BACKUP could/would do
was to read what was previously recorded. Once formatted, the density was
easily recognizable by whether a read was successful. But the lack of a
sensor meant that FORMAT did not have a clue.
Received on Thu Dec 19 2002 - 21:19:01 GMT