On Mon, Nov 17, 2025 at 4:41 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.
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
