That's interesting. Even allowing for the hiding of defects, 5 years
is a long time to be lucky with a failing hard drive
I usually see the reverse; drives that SMART says are OK, but that
have failing sectors and slowdowns due to sector retries.
Several technologies aim to sweep bad sectors under the rug - in fact,
SMART may have been a response to consumer anger about this:
- hard drive's firmware swaps sick to good sectors on the fly
- NTFS driver code swaps sick to good clusters on the fly
- ChkDsk /F and AutoChk equivalent swaps sick to good clusters
Of these, only the last has some visibility; the other two processes
are in the background and don't report what they do. In particular,
bad sectors managed by the hard drive's firmware will not show up as
bad in the map that the OS maintains for the file system.
So while disk diagnostics will (or should) tell you whether sectors
currently in the firmware's address space are readable or not, they
can't tell you about bad sectors that have been swapped out of this
address space by the hard drive's firmware. The only record of that
would be the statistics that SMART can report - if you find a SMART
reporting tool that shows you this raw data.
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Cats have 9 lives, which makes them
ideal for experimentation!