WTD - MFM or RLL 5.25in Half Height drive

Hi guys, Does anyone have a spare 5.25-inch half-height MFM or RLL ("ST506" interface) hard drive? I'm trying to resurrect an AT&T UNIX PC, but its Microscience HH-1090 drive is basically a brick. I can format it with the Diagnostics disk, but the install floppy falls down when it tries to 'mkfs' the root filesystem. Running mkfs manually produces a "write error" message. Mapping the bad block doesn't help in the least, and the diag floppy reports 76 bad block table (remap) entries when I run the S4TEST (expert mode) disk diagnostic... Anything <= 1400 cylinders and 8 heads would work fine (though I could always lie to the machine and specify a lower head and cylinder count) but ideally I need (cylinders * heads * 16 * 512) to be >= 40MB. There's a bit more about this requirement and why here -- http://unixpc.taronga.com/faq/part2/faq-doc-6.html The machine may have a WD2010 controller (I'm not sure, I need to crack 'er open and check) but it certainly doesn't have the P5.1 upgrade PAL. Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/