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Repairing bad sectors in an external drive
(discuss.tchncs.de)
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ddrescue to the rescue! This is the best advice to get the data out. Don’t muck about too much because more things can fail. Use ddrescue to rescue the data and write a disk image somewhere else. Then make another copy of this one and try to do the filesystem rescue magic on that copy. Really make sure the bad disk marked as unusable.