This will also attempt to recover data from any bad sectors it finds;
and mark the sectors as 'bad' so they won't be used again.
If after running CHKDSK, you suspect there are still more low-level
physical problems with the drive, you'd want to run the hardware
diagnostic utility supplied by the relevant disk vendor - eg Seagate,
Western Digital etc. Check their website for downloads.
Steve Gibson's SpinRite6 <http://www.grc.com/sr/spinrite.htm> is
getting a bit pricey, at $89USD for first time buyers, but can be
effect for salvageable HDDs. This utility will resurrect repairable
sectors (versus clusters) and mark those bad that won't repair.
Though written by/for Hitachi, their Drive Fitness Test (DFT) can be
helpful testing any HDD. This is a passive test.
The freeware version of HDTune scans for bad clusters as well report
the informative S.M.A.R.T. values stored in a HDD. This too is a
passive test.
Most would suggest you obtain the unique HDD's manufacturer written
diagnostic downloadable from the individual web sites.
GIYF Eric.
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