27 Nov
2010
27 Nov
'10
5:53 p.m.
On 11/27/2010 09:27 AM, Chuck Guzis wrote:
mIn my experience, SCSI drives are still plentiful and
show no
imminent sign of disappearing. With a bit of looking, even MFM
drives aren't hard to locate and they've been obsolete for more than
20 years. Aside from PATA drives, I have more SCSI hard drives than
any other type.
PATA drives, and many but not all SCSI drives, are out at the far end of
the bathtub curve. This means that their reliability is now very
questionable. Contrary to popular belief, the MTBF figures in the drive
specifications do not give any information about expected longevity of a
single drive, so an MTBF of 200,000 hours does not mean that a single
drive is expected to last 22.8 years. The MTBF only applies during the
design life of the drive, which is usually five years. Beyond that,
you're living on borrowed time.