I have 3 seagate barracuda 500 gb sata drives in my computer, and yesterday one of them stopped working. when i try to boot from it it says "choose another boot device" or something to that effect, and when i boot from another drive, the affected drive doesn't show up at all! i have no idea what could cause this, as it never made any noises or anything to indicate failure was imminent, and it is only a few months old. if anyone has any ideas on what the problem could be, please let me know!