On 01/02/2010 16:28, Mikael Abrahamsson wrote: [...]
Since the drive has ECC, it would be interesting to see the amount of read errors ECC has corrected. Would also be interesting to know if the drive will rewrite a sector if it's ECC corrected, so that ECC doesn't have to kick in next time (or if they're actually operating in so narrow margins that they actually use the ECC constantly because the s/n ratio is bad and that this is part of the design).
I think that's exactly what's going on. There may also be some level of correction above which the drive will transparently rewrite after read, e.g. if the limit for correctability is X bits per sector, it'll automatically rewrite when it's had to correct 90% of X bits, but any less than that is just normal operation.
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