On Mon, Nov 17, 2025 at 2:41 PM Mike Katz via cctalk <[email protected]> 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? > I have (well had) a ST-251-1 (so basically the same drive) that had 2 tracks formatted with 256 byte sectors, 2 tracks with 128 byte sectors and the rest 512 byte sectors. The first 4 tracks were for some funky 'partitioning' software that either the controller or the disk driver for the OS needed. It was some weird Epsom system, I think. It's been a while and I traded it away years ago. Warner
