Brad Campbell wrote:
I've never seen this behaviour in a drive. All the drives I've seen mark
bad sectors as "pending reallocation", they they return read errors on
that sector unless they manage to jag a good read, in which case they
then reallocate the sector. Or else they wait for you to write to the
sector triggering a reallocation.
This is exactly what they are required to do by the relevant standards.
The drive can not silently discard data and reallocate the sector. It
either has to get a successful read of the old data, then reallocate, or
wait for the host to write new data, and store that in the new location.
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