simpswr

I'd download an run diagnostics on the drive to rule out drive failure:

Samsung http://www.samsung.com/global/busine...ort_HUTIL.html
Seagate/Maxtor/Quantum http://www.seagate.com/www/en-us/sup...oads/seatools/
Western Digital http://support.wdc.com/download/
IBM/Hitachi http://www.hgst.com/hdd/support/download.htm#DFT
fujitsu/Seimens http://www.fcpa.fujitsu.com/download...es/#diagnostic
IBM/Hitachi http://www.hgst.com/hdd/support/download.htm#DFT