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From my experience in industrial computing (think of your telephone company's equipment for running the damn phone system), only SCSI drives seem to still always be posting MTBF or RTBF. Consumer level drives (IDE and SATA) seem to be shifting to number of power cycles the drive can handle.
I don't remember what we have seen as far as which drive has the best numbers, but a good simple way around it is to run a RAID (either mirrored or go for the gusto and do a higher number, such as RAID 5, or 10 [yes it does exist, and it is WAY overdone]).
And even if you do back up the stuff from your hard drive to CD or DVD media (or tape), you might want to check your back ups every now and again (if it isn't easily replaced). Just a tip from my own misfortune.
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Übergeek...
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