In too many cases, they're a lot worse
I have two RAID arrays and a 5 disk Thecus NAS attached to my soho network with a Mac Mini dual drive server. I've had the usual horror stories about the drive that arrived working and died two days later after it was loaded for years (note, not limited to that particular event).
What's happened on the RAID servers is more trouble. The Thecus got 5 Seagate ES2 enterprise grade 1 TB HDs, damned expensive compared to standard issue. They have all failed plus one. FWIW, everything is UPSed and we have full redundant power generator with clean power. Two refurbished drives died just outside their warranty. The accumulated errors brought the raid 5 array down to one non-working drive, and then one degraded drive before the first (a refurb). This destroyed the RAID but fortunately it was mostly backed up. It's since been rebuilt with lower end drives and has been running fine. The Seagate 5900rpm drives in one RAID has been kicking without trouble for two years. The other just came on. We've had more trouble with WD than I want to think about.
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