Posted Dec 11, 2008 16:50 UTC (Thu) by anton
In reply to: Correctness
Parent article: Tux3: the other next-generation filesystem
A disk will happily write half a sector and scribble
trash. Most times reading that sector will report a failure, but you
only get reasonable odds.
Given that disk drives do their own checksumming, you get pretty good
odds. And if you think they are not good, why would you think that FS
checksums are any better?
Concerning getting such damage on power-off, most drives don't do
that; we would hear a lot about drive-level read errors after turning
off computers if that was a general characteristic. However, I have
seen such things a few times, and it typically leads to me avoiding
the brand of the drive for a long time (i.e., no Hitachi drives for
me, even though they were still IBM when it happened, and no Maxtor,
either; hmm, could it be that selling such drives leads to having to
sell the division/company soon after?); they usually did not happen
happen on an ordinary power-off, but in some unusual situations that
might result in funny power characteristics (that's still no excuse to
corrupt the disk).
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