3.5" Altair CP/M

Fred Cisin cisin at xenosoft.com
Sun Jun 3 17:11:51 CDT 2007

On Sun, 3 Jun 2007, Curtis H. Wilbar Jr. wrote:
> I also believe if you are formatting the 3.5" drive at SD, you best be using
> 720K 3.5" media...  HD media will probably not work well, or not retain data
> (much the same problem as using non HD formats on HD 5.25" disks).
> I know I did SSSD on 720K 3.5" media on my Atari using my ATR8000.
> Worked fine.

A reasonable concern.
But, good news (for a change).
The problem with wrong media for 5.25" is an issue of 300 Oersted v 600
Oersted.  2:1 ratio
But, ...
3.5" "720K" is about 600 Oersted, and "1.4M" is about 750 Oersted.
1.25:1 ratio
Although you are still dealing with wrong coercivity, it is much less
wrong than that of the 5.25".  Therefore, 1.4M would not be different
enough to prevent playing and some non-critical testing.  However, try to
get the right disks wonce you are using them for anything that matters.

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