The 32-bit IO and multcount work only for PIO, not DMA.
On some drives (?), multcount might even slow down DMA,
though there is no evidence to support this theory.
Neither of these buys anything when DMA is used.
The write-caching can be turned on ("hdparm -W1") to speed up writing,
but one must be careful to turn it off again at system shutdown,
to ensure the cache is flushed before reset or poweroff.
> This has worked fine on the 5 other non UDMA Western Digital drives I
> use, but enabling these features on the new UDMA drive causes the drive
> to continuously timeout and become unusable. I have to settle for the
> default bootup settings in order to use the drive. I'm just curious if
> this seems to be a kernel problem, hardware problem, or an hdparm problem.
Mmm.. not sure what the issue might be.
See if things are any different with 2.1.73, when it appears.
-- mlord@pobox.com The Linux IDE guy