Some drives default with write-cache on, regardless.
You can turn it off, and if the drive thinks it is stressing it will turn
it back on because it determines that you really did not mean to turn it
off.
Even if you ask it in the WC is off, it will say yes (it is off)
regradless that it turned itself back on. :-(
The early interrupt assertion is in one direction only, because it who
owns the strobe. The drives report complete of a write to host because of
a write to buffer is complete.
The hard part will be to define directions based upon the referrence point.
direction | host[OS/Driver|Adapter] -|- drive[buffer|platter] | direction
read | | | write
write | | | read
This table is useless until I figure out how to best explain it.
Cheers,
Andre Hedrick
The Linux ATA/IDE guy
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