DragonFly users List (threaded) for 2005-04
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Re: theoretical question about disks and os
:Is it possible for a poorly written disk driver/filesystem to trash
:blocks on a hard disk? By trashing I mean that subsequent access result
:in an i/o error, aven accross reboot.
No. It's possible to purposefully blow up a disk by e.g. garbaging
up the defect list and doing a format. It isn't possible to do it
accidently with normal reads and writes.
:I have such a disk where it happened a few years ago. Curiously, the
:damaged blocks where the first blocks of partitions that where mounted.
:The maker's test software says the drive's ok, as well as s.m.a.r.t.,
:although it needed a "reformat" with the same tool to get rid of the bad
:blocks.
It's unlikely that software had anything to do with the damage. More
likely the disk overheated or got jostled or had a failure just as
the filesystem happened to be doing a write to those sectors.
-Matt
Matthew Dillon
<dillon@xxxxxxxxxxxxx>
:I would think it must be some kind of hardware failure, but a recent
:discussion about linux filesystems makes me wonder... linux was running
:on that disk, after all, with reaiserfs. And it was 3 years ago.
:
:Raphael
:
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