[cctalk] ST-251 MFM Hard Drive sector size question

[Mike Katz via cctalk]

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?

Thank you,

         Mike