I ran through the other tests and everything passed.Īs noted initially, we get pauses and jitters in live and recorded playback. when I got back, the receiver was displaying whatever the channel was playing, so I have no idea what that means as far as results. Started the surface test, but had to leave.
#Hard drive power on time 21200 verification
Thanks to stan39, i was able to find and run the tests.įile System Verification - passed, no errors And you don't own the recordings, so there's little incentive for copyright owners and manufacturers to give you the ability to create back-ups.Ī bit of a surprise, at least to me. That's one reason we point out to people who get large external drives that the DVR was designed a s a "time shift" device, not something for long-term storage of recordings. Third, beyond five years you are probably living on borrowed time. Second, there's a pretty good chance a disk drive will fail during its five-year life. So what does that mean to us? First, disk drives can fail at any time, over the five year "life" the ARRs don't seem to change much. The situation in DVRs might be different.įYI despite people's preferences for/against certain manufacturers, there have never been real figures that show one manufacturer is any more reliable than others. Third, the studies are a few years old, and reliability might have improved since then.Īnd last, this is for disk drives in computers. But beyond "end of life" (5 years) the ARR certainly seemed to increase, to as high as 25% in some cases. Second, for disk drives there didn't seem to be a "bathtub" effect - our general perception of electronics is that it usually fails in the first few weeks of use, then the failure rate settles down, and then rises at the end of life. (Sounds like the problem DirecTV has, a very high percentage of the receivers returned to them show no problems, although some of them fail again when they are shipped back to customers as replacements). Manufacturers claimed that as many of 50% of the drives returned to them were not faulty.
First, the definition of failure was not the same. To put it another way, an ARR of 8% means that one out of every 12 drives failed each year.Ī couple of comments. To be specific, the studies showed that in the first five years of use, the annual replacement rated for disk drives in computers was between 3 and 8%. However, a couple of big studies showed that "real world" annual replacement rates were much higher than manufacturers quoted numbers. manufacturers do quote MTBFs (mean time between failures) and annual replacement rates. That's not when a disk will fail, it basically says "we won't really concern ourselves with failures that occur beyond a five-year "life". Jimmie - FYI that number is misleading, MTBF and failure rates are subjects I have lots of experience with.įirst, manufacturers usually give disks a nominal lifetime of 5 years.
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