a.f. domino on 13 Apr 2016 14:23:26 -0700 |
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Re: [PLUG] Desktop Support ? |
On Wed, Apr 13, 2016 at 1:35 PM, Keith C. Perry
<kperry@daotechnologies.com> wrote:
> Things aren't quite that clean- once electrical systems go out of spec (e.g.
> under or overvoltage how that is caused... e.g. source, parasitic, cascading
> events creates a dynamic failure) all bets are off since it is impossible to
> detect and trap multi-system faults unless you have external supervisory
> circuitry in place.
Is there any kind of study on this? That is certainly not my
expectation for a hard drive, and (not being an EE) I'd think that you
could design a circuit that stopped writing when the voltage supply
dropped. The drive already has the ability to retract the heads after
a power failure, so it has some kind of capacitor/etc for such things.
If the drive is retracting the heads on a power failure that would
also preclude it from writing anything while those heads aren't over
the drive.
It sounds like somebody just needs to boot a rescue disk and fsck the
filesystem and see what is going on. If it looks serious I'd probably
clone the drive before attempting repairs.
--
Rich
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