Dwight Elvey <elvey(a)hal.com> wrote:
Before anyone can help you, you need to find out if
the
drive is soft or hard sectored.
Dwight (and Tony), thanks for the info.
It looks like both machines have only a hard sector (H17)
controller. All the disks I have are hard sector disks. It's
a bit mysterious why none of the HDOS disks will boot,
but the CP/M disks will. I would suspect bit rot, but when
I check out the CP/M format disks, they *all* seem to read
fine. I wonder if it has to do with the drive's rotational
speed? I'd like to calibrate it, but I'm afraid doing so
might destroy the disk I put in there. BTW, is there any place
left that sells hard sector floppy disks?
Or perhaps the CP/M file system had more error correction,
and thus CP/M is better able to recover flaky disks? These
disks are all 20 years old now, after all...
Dave