It sounds like you have a drive failing. Re-seat, or change the cables. Maybe just a bad connection or cable. Also you can run a program like Spinrite. It's a low level hard drive repair tool. If it can be repaired this will repair it.
GRC*|*Hard drive data recovery software**
(I usually only recommend free software, but I've had much success with this)
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RAID 0 (striped disks) distributes data across several disks in a way that gives improved speed and full capacity, but all data on all disks will be lost if any one disk fails. RAID - Wikipedia, the free encyclopedia |