17 Nov
2025
17 Nov
'25
5:47 p.m.
On 11/17/25 15:33, Mike Katz via cctalk wrote:
I have an ST-251 42MB MFM hard disk drive.
The documentation says the drive is 512 bytes per sector.
I don't know if this is fixed (hard sectored) or not.
My problem is my operating system (OS/9 Level II) wants
256 bytes per sector. The OMTI 20C-1 controller can
handle that but I'm not sure if the ST-251 can.
Does anyone know if the ST-251 can support 256 bytes per
sector and/or how to configure it for 256 bytes per sector?
MFM drives are formatted entirely by the controller. The
one thing the drive requires is the correct bit clock rate.
There is a write clock and a write enable signal on the
20-pin connector.
Jon