From: Anders Carlsson (anders.carlsson_at_sfks.se)
Date: 2007-03-22 19:29:14
Ethan Dicks wrote:
> back in the day, it was more than just C/H/S issues
A Microsoft (!) KB article on MFM/RLL drives:
http://support.microsoft.com/kb/36948
Based on that document, we have:
Tandon 602S: 4 heads, 153 cyls, RWC 128, WP 153
Tandon 603S: 6 heads, 153 cyls, RWC 128, WP 153
Seagate ST-225: 4 heads, 615 cyls, RWC 615, WP 300
Seagate ST-251: 6 heads, 820 cyls, RWC 820, WP 820
Seagate ST-506: 4 heads, 153 cyls, RWC 128, WP 128
The ST-225 is known to replace 602S, and Ethan has previously on
this list(*) pointed out that the ST-251 should be possible to use
instead of a 603S, if you can dig one up.
Generally, does a disk need to have a "minimum" RWC and WP in order
to theoretically work as a replacement? The ST-506 above has a lower
Write Precomp number than the Tandon disks, while both the ST-2XX
disks surpass all specs by far.
More detailed specs on the Seagate disks:
http://chemeng.p.lodz.pl/zylla/seagate/mfm/
Of course, if Bill only has access to a bunch of ST-506 disks, it
doesn't help much recommending other models to try, in particular
as he has been on a hunt for the right hard disk for a couple of
years now... ;-)
(*) http://www.softwolves.pp.se/misc/arkiv/cbm-hackers/11/11362.html
--
Anders Carlsson
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