1.2M HD / 300kbps / single-density
cc at corti-net.de
Mon Mar 19 06:05:18 CDT 2007
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).
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