19 Mar
2007
19 Mar
'07
4:05 a.m.
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