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Checks HDD for bad sectors, just like scandisk or chkdisk under some other operating system ;-).
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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48 hours to check 1.2% of my 320 GB disk on a Core 2 Duo Processor p7350...
@ nickwe: I can run this on 1TB 7200rpm drives in about 45 minutes, my guess is that you're saturating your hdd with other IO
@nickwe you could try increasing the amount of blocks that badblocks check at a time with the -c #