On Wed, 15 Jun 2011 20:37:31 -0700 Mike Power <mpower@xxxxxxxxxxxx> wrote: > From what I understand when a hard drive loses a block it replaces it > with another block but it can not recover the data. > If it read from the disk that had the block it gets garbage for data. This is not true, an HDD will never return garbage data just because it needed to remap a bad sector. And that's the reason why bad sectors will return I/O error (unreadable) instead, and are not remapped anywhere until you try to WRITE into these sectors. At that moment, when the hard disk has new user data for that sector, it can finally do the remap and put it somewhere else on a remapped good sector. -- With respect, Roman
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