17 Nov
2025
17 Nov
'25
2:10 p.m.
On Mon, Nov 17, 2025 at 4:41 PM Mike Katz via cctalk
<cctalk(a)classiccmp.org> 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.
It is 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.
It 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?
You don't configure MFM drives for that. The LLF on the controller
takes care of it.
You can stuff an ST-251 into a Commodore D9090 hard drive box and it
will format to 32 sectors of 256 bytes per sector. Works great.
-ethan