27 Dec
2006
27 Dec
'06
11:11 a.m.
From: Pete Turnbull <pete at
dunnington.plus.com>
dwight elvey wrote:
Ahaa. I'd thought that it might be different coercivities. I've been using
1.44M disk in my Cat without issues. It has a disk test mode that writes
patterns and reads. It was able to run for several hours without failure.
I know that 1.2Meg disk don't work well in 360K drives but the drive they
used in the Cat must be more forgiving.
I wonder if when replacing the drive, it might make sense to have the
HD mode selected when using 1.44M disk, even though writing with
720K rate? I suspect it should work well. When I rig up another disk,
I'll give it a try. A little more write current shouldn't cause too much
issue at the slower rate of data. I don't have to worry about write through,
the Cat only uses a single side.
Dwight
I've been told that there are a few that
don't support the 720KB.
I'm not sure what tyhe difference is for the drive. The rpm isn't changed,
just that they use FM instead of MFM. It might be that they change the
size of the read data pulse or something.
It's not FM. The format commonly referred to as 720K is MFM (double
density), but at half the data rate of the HD format (which is also MFM),
and that's why the write currents are different and the disks are different
coercivities.
--
Pete Peter Turnbull
Network Manager
University of York
_________________________________________________________________
Fixing up the home? Live Search can help
http://imagine-windowslive.com/search/kits/default.aspx?kit=improve&loc…