I have a 1D4 mainboard, and after reading this thread, i knew there were timing errors with this board, but it got me thinking.
with a blizzard 030, solid and stable as a rock. nothing could break it. the same with a blizzard PPC. all fine on the western front.
but as soon as i try an IDE accelerator, i get problems and disk errors, partition trashing etc as soon as i try to use faster disk xfer speeds than PI/O mode 0.
IDE fix express seems to be the only one that works happily. i guess this is a symptom of the mainboard timing issues?
(obviously scsi works perfectly, but hey, i can't fit a scsi drive in the desktop case ;-) )