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Dan Desjardins
Director
Redactive Archive Management
1407 Willow Trail
Middleton, WI 53562
Phone: +1.608.204.9848
Fax: +1.608.204.9848
Mobile: +1.608.445.NEWS (6397)
-----Original Message-----
From: cctech-bounces at
classiccmp.org [mailto:cctech-bounces at
classiccmp.org]
On Behalf Of Christian Corti
Sent: Monday, March 19, 2007 6:05 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: 1.2M HD / 300kbps / single-density
On Sun, 18 Mar 2007, Dave Dunfield wrote:
To verify that the drive was good, I hooked it up and
tried
to read/write some disks - to my surprise I could not do
single density (at 300kbos). Tried a couple other HD drives
with the same result. On a hunch, I modded it to 300rpm, and
sure enough, I can read/write single-desnity fine at
300rpm / 250kbps.
That's a known problem with many FDCs, they can't handle FM at 150 kBit/s,
only at 125 kBit/s. So either jumper your drive for dual speed (so it will
spin at 300rpm for 125/250 kBit/s and at 360rpm for 250/500 kBit/s) or
jumper it for single speed at 300rpm (therefore making a 5,25" drive look
like a 3,5" drive to the BIOS).
Christian