I have been using recertified, or used enterprise class drives which have a crystal disk info good health report. These have waaaayyy higher MTBFs than consumer grade, as in 10x more, so a drive with 40.000 hr. on it, may have 10x *theoretical *the life left. do remeber that the M in MTBF means mean, it doesn’t mean guaranteed time between failure. Enterprise drives tend to be noisier.