I got basicly same problem and basicly same way started the problem, i have Vista X64 and 8800GTS too but without Raid things just one SATA drive. Dont think its related to that anyway. So i think its some Vista bug i first thought my hard drive is broken... Btw if you solve your problem, post it here... Seems to me same problem we are having http://www.msfn.org/board/KB941649_problems_t105515.html