RAID is much less effective than it used to be. Current BER (non recoverable read error rate) is around ~1/10^14. If you lose a drive, the probability of you

RAID is much less effective than it used to be. Current BER (non recoverable read error rate) is around ~1/10^14. If you lose a drive, the probability of you encountering an error when rebuilding the RAID is rapidly approaching 1 as time goes on - BERs are not decreasing nearly as fast as drive sizes are increasing. (This assumes you are using a RAID where you can lose 1 drive and be fine. RAIDs where you can lose 2+ drives are still fine for now.) And this isn't taking into account catastrophic controller failure, damage due to a faulty power supply / surge, etc.