Largest ST-506 (MFM or RLL) type HDD?

Al Kossow wrote: TH99 lists that as 1224 cyl, 15 heads, 33 spt, 256 bytes per sector. And the prize for "biggest MFM disc" goes to.... Also, I wasn't aware that there were any MFM drives that handled precompensation on-disk. That's useful to know. Maybe, but I need to find a spec for the ESDI interface first. Wikipedia's entry is decidedly thin on actual information (and Google just keeps giving me links to the usual scam and keyword-stuffing sites). It looks like in ESDI, the drive handles all the bit-level encoding and decoding (so it's about half-way between MFM/RLL "dumb" drives and SASI/SCSI/ATA "embedded controller" drives). That means the actual read/write stuff might be easier, but I doubt you'd be able to put both MFM and ESDI in the same FPGA microcode (the I/Os would be vastly different). You'd still have to deal with finding bit-sync markers... Hm. Maybe later. -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/