| According to Data Recovery Labs ,
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| | and that his goal is not "choosing the
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| External Hard Disk Drives provide great
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| | best and the worst vendors" but to help
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| flexible storage option and security by
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| | them to improve drive design and testing.
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| providing a mobile back upoption, yet
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| | Also, little difference in replacement
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| this advantage has dangerous twist to
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| | rates between SCSI, FC and SATA drives,
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| users.
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| | potentially an indication that
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| With storage capacity running in hundreds
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| | disk-independent factors, such as
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| of Gigabites, with high rates of data
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| | operating conditions, affect replacement
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| transfer, in addition to the flexibility
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| | rates more than component specific
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| to plug the external drive to a Laptop ,
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| | factors. On the other hand, we see only
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| Desktop, Server , Memory cards , Camera
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| | one instance of a customer rejecting an
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| or iPod and sold at reasonable prices
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| | entire population of disks as a bad
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| have increased their popularity
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| | batch, in this case because of media
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| dramatically.
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| | error rates, and this instance involved
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| However, as the popularity of the
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| | SATA disks.
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| external drives containing backups and
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| | Time between replacements, a proxy for
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| valuable data are increasingly to
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| | time between failure, is not well
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| accomodate the bigger Music & Photo files
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| | modelled by an exponential distribution
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| emerging from Apple-Mac sysytems &
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| | and exhibits significant levels of
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| Xserevers. External drives are failing
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| | correlation, including autocorrelation
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| for no apparent reasons. Majority of
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| | and long-range dependence.
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| these failing drives are often of well
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| | Generally, inside the slick casings,
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| known commercial brands such as Lacie,
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| | often are poorly ventilated or even not
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| Freecom and Omega and with the latest
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| | ventilated at all, external hard drives
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| high capacity Maxtor, Seagate or Western
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| | assemblers include the cheapest available
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| Digital hard disk drives models with
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| | drives such as Maxtor & Seagate, combined
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| storage capacity exceeding 320Gb or even
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| | with badly ventilated enclosure casing,
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| 400Gb on a single drive.
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| | the combination is catastrophic for any
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| According to a study of 100,000 drives
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| | given user, especially when the hard disk
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| conducted by Carnegie Mellon University,
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| | drive is of high capacity containing
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| it is widely believed Hard Disk Drive
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| | crucial back-up data
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| vendors manipulate the (MTTF) - mean time
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| | For any given Lacie with multiple drives,
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| to failure. In fact The mean time to
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| | this can be a terrible experience with
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| failure (MTTF) of drives, according to
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| | RAID drives and data in excess of 1
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| their manufacturers, vary from 1,000,000
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| | terabite. Often with RAID array external
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| to 1,500,000 hours, suggesting a nominal
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| | drives, the drive failure are more
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| annual failure rate of at most 0.88%.
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| | frequent and the damage is more extensive
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| Whereas the study finds that "up to 13%
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| | than single drives. According to Haj
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| observed on some systems.". This suggests
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| | Majed Aziz of UniRecovery - RAID Data
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| that field replacement is a fairly
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| | Recovery Labs "many of the 1 terabyte
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| different process than one might predict
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| | LaCie external drives contain 250Gb
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| based on datasheet MTTF.
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| | Maxtor IDE in RAID array, inside badly
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| It has also been established that failure
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| | ventilated enclosures, when used on
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| rate is not constant with age, and that,
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| | regular basis, especially within office
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| rather than a significant infant
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| | environment, they are utter disaster."
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| mortality effect, evidently a significant
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| | Hitachi has unveiled a drive which has
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| early onset of wear-out degradation. That
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| | reached the new heights of one terabyte
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| is, replacement rates in research data
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| | (TB). Its drive looks like any other, but
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| grew constantly with age, an effect often
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| | uses perpendicular magnetic recording to
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| assumed not to set in until after a
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| | make space for all that data.
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| nominal lifetime of 5 years. The study,
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| | The current technology generation of
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| also carefully point out that the study
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| | LRT-Longitudinal Recording Technology,
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| didn't necessarily track actual drive
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| | which records the bits laying
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| failures, but cases in which a customer
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| | horizontally, has been superseded by the
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| decided a drive had failed and needed
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| | recording of the bits standing
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| replacement. The study also explains that
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| | vertically. However the cost is in the
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| no vendor-specific failure information,
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| | region of $18,000 !
|
