23 Apr
2013
23 Apr
'13
11:11 p.m.
On 4/24/2013 12:22 AM, Tothwolf wrote:
On Wed, 24 Apr 2013, Terry Stewart wrote:
At this point, I wasn't so much
worried about long term usage. If I can
boot the unit with the disk, I'd load some utility and create an image
on the unit itself.
On Wed, Apr 24, 2013 at 3:55 PM, Tothwolf
<tothwolf at concentric.net>
wrote:
Is this reliable in the long-term though? Is it even possible to write reliable 360K disk
using a 1.2MB drive? It
had been ages since I worked with some of these drives since a lot
of my
stuff is packed away, but I seem to remember that I always had to use a
360K drive when /writing/ 360K disks, while I could still read 360K
disks
in a 1.2MB drive just fine. (The tracks written by a 1.2MB drive are
narrower than those written by a 360K drive?)
Yes, it's possible to write a 360k disk in a 1.2MB drive. See
http://www.classic-computers.org.nz/blog/2010-02-18-writing-cpm-from-1.2mb-…
If you then read/write a 360K disk in a true 360K
drive that was
written to in a 1.2MB drive, won't you have odd issues with the track
widths? What I seem to remember from years ago was a 1.2MB drive could
not reliably overwrite data on a 360K disk because the tracks written
by a 1.2MB drive were narrower, so when you would then work with that
disk in a 360K drive, the 360K drive would pick up data from the
original wider 360K drive track and the narrower 1.2MB drive track.
Maybe this would work ok to a limited degree with a 360K floppy that
had been bulk-erased prior to writing in a 1.2MB drive, which was then
never written to again in a 1.2MB drive after being written to in a
360K drive?
I am using truly blank diskettes, and I'm not intending to write to
the
disks after creation.
Jim
--
Jim Brain
brain at jbrain.com
www.jbrain.com