On Mon, 7 Jan 2008, Thiemo Nagel wrote:
What you call "pathologic" cases when it comes to real-world data are very
common. It is not at all unusual to find sectors filled with only a
constant (usually zero, but not always), in which case your **512 becomes
**1.
Of course it would be easy to check how many of the 512 Bytes are really
different on a case-by-case basis and correct the exponent accordingly, and
only perform the recovery when the corrected probability of introducing an
error is sufficiently low.
What is the alternative to recovery, really? Just erroring out and letting
the admin deal with it, or blindly assume that the parity is wrong?
/Mattias Wadenstein
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