Error detection thumb|Error rate measurement on a DVD+R. The minor errors are correctable and within a healthy range. Impending failure on hard disk drives is estimable using S.M.A.R.T. diagnostic data that includes the hours of operation and the count of spin-ups, though its reliability is disputed.
Error detection thumb|Error rate measurement on a DVD+R The minor errors are correctable and within a healthy range. Impending failure on hard disk drives is estimable using S.M.AR.T. diagnostic data that includes the h.ours of operation and the count of spin-ups though its rel,iability is disputed.