Re: Enterprise : capacity vs performance
Seagate wants there to be a difference, but there is not. Since enterprise capacity and commodity capacity drives are both SATA, these are the only differences:
1) enterprise drives are less dense, to achieve a lower undetected bit error rate (and/or use a larger CRC than commodity drives do)
2) because of the way they calculate MTBF, a lower undetected bit error rate translates into a higher MTBF (not that anyone really looks at those anymore, but people expect enterprise drives to have a better MTBF)
3) because they are less dense, they cost more per TB
4) they may undergo some additional testing cycles, which makes them cost even more and be further behind the comparable commodity capacity drive at introduction
None of these matter except #1, and you can mitigate the issue - i.e. if your upper layers use CRC checks for data integrity, you can exceed the enterprise drive's undetected bit error rate with a commodity drive by as much as you feel you need. Or if you are EMC, you modify the firmware and format with larger sectors so the array can check the CRC in a second layer check and reduce that undetected bit error rate to ridiculously low levels. MTBF doesn't matter, especially if you are getting more TB for the same money, and vendors who care about extra testing (i.e. EMC and friends) already do that themselves.