<> > It means patching the BIOS to reflect the format differences, and of <> > course you cannot format to 1440k (HD). Allison has done the 3.5" thin <> > I believe. <> <> I'd love to know how this is done. :) Real simple, mine has turbo rom and that knew about 80track two sided drives. I used a 3.5" disk with the advent personality card configured so it looks like a 5.25 80track dd drive and I get 782k per disk (close enough for 720k(different number of sectors but otherwise legit)! The drive was mounted in one of the two hole vacated but the 360k HH drive using a 3.5" to 5.25 adaptor bracket. The 3.5" drive is an older one that has a select switch for one of four drives. A newer drive can be used but you need to make a "odd" cable. Allison