Re: Help with Apple II+ and Disk ][

[Patrick Schaefer <pa.schaefer@fz-juelich.de>]

Chad Choi Lin wrote:

> > Hi. I didn't realize you couldn't use 5.25" HD disks in the Apple 5.25"

> I actually tried that once -- inserted a blank HD 5.25" disk and
> attempted to format it as a DD disk -- and, believe me, it doesn't work!
> However, I am at a loss to explain *why* that should be true. For the
> edification of the newsgroup at large, could someone provide us with a
> answer to this puzzle?


HD disks have a higher coercivity force. That means you will need a
stronger magnetic field to write information onto the disk. Sometimes it
works, but you will lose your data after a certain time.

Of course this applies for 3.5" disks, and also for Metal audio tape
(vs. cromium dioxide) and DDS-3 streamer cartridges.


Patrick