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| Computers Forum Index » Computer Architecture - Storage » disk error bursts... |
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| Bill Todd... |
 Posted: Fri Jun 12, 2009 9:17 pm |
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The frequency with which disk sectors become unreadable seems to have
remained relatively stable over the years, though one might hope that it
will decrease significantly with the expected move to 4 KB sectors (at
least if correction bits per sector increase somewhere nearly
commensurately).
But it's difficult to find information about how frequently error bursts
that result in unreadability span a sector boundary. In particular, I'm
interested in whether two successive sectors ever (in a practical and
quantifiable sense) become unreadable due to a single error burst, and
if so whether such a burst ever affects more than two successive sectors
(it would also be interesting to know how frequently bursts span tracks
such that they affect sectors on adjacent tracks, though that is of less
immediate significance to me). If such large error bursts tend to be
the result of damage caused by physical contact with the disk head that
is likely to destroy significant portions of the platter that
information would be interesting as well, since my main concern involves
the incidence of two-successive-sector and
more-than-two-successive-sector unreadability caused by 'bit-rot'
compared with that of single-sector unreadability.
Does anyone know of accessible studies providing such information?
Thanks,
- bill |
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| Gavin Scott... |
| Posted: Sat Jun 13, 2009 2:06 am |
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In comp.arch Bill Todd <billtodd at (no spam) metrocast.net> wrote:
Quote: But it's difficult to find information about how frequently error bursts
that result in unreadability span a sector boundary.
Well, ancedotally speaking, most of the disk failures I've seen on
my systems have involved clusters of often sequentially unreadable
blocks.
Quote: Does anyone know of accessible studies providing such information?
I imaginge thse guys would be good people to ask...
http://research.google.com/pubs/pub32774.html
G. |
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