I have been looking (since August) for an answer to Win 7/Event 11/random reboot errors with WD 600gb Raptor as boot drive. Finally, lots' of BSOD's ending in Windows meltdown and I yanked Gigabyte x58-UD5 and replaced with Asus Sabertooth.
Immediately, Atapi 11 "The driver detected a controller error on \Device\Ide\IdePort0" again - about 10 per minute. Installed Marvell driver, new error Marvel 91xx (timed out) appears.

Took Raptor off of 6Gbs port and all errors disappeared. I thought to post this to see if anyone else had same problems with same HW combos. Seems like it's controller/HDD don't like each other. Anyone else with same circumstances?