Surprised your 500GB drive went also.....
There are lots of complaints on tech boards about SATA drives >1TB and larger having high failure rates regardless of what brand you have. Drives that used to come with 3-5 yr warranties are now only giving you a year or two! This is a good indication that overall all newer large SATA drives are having quality issues. The old IDE drives by comparison were built like tanks. I never had an IDE drive fail.
For example, my 3 yr old Seagate 1TB SATA drive recently failed. Luckily it lasted about a month before totally crashing, which allowed all important files to be saved. W7 and Linux was dual booted on that 1TB drive. Linux first reported there were HHD issues and gave a full comprehensive report like you would get from a PC repair shop, for FREE of course!....It reported issues were on the W7 side. Linux side still ran fine. Then a couple days later Dell on booting up, reported HDD problems. For giggles I booted up W7 which ran OK for a couple more days before M$ said there were problems. Then all M$ said was 'drive failure is imminent'! Backup & replace ASAP. A couple days later W7 refused to boot but Linux still ran fine allowing anything important to be saved on BOTH sides of that failing HDD.
Honestly I've only had a single problem with sata drives 1TB and over (I've purchased eight over the last few years), a 1.5TB Seagate Barracuda Green Drive. At the time green drives were new and unfortunately I didn't research the tech beforehand. Live and learn.

