If it passes, you can clone the clone back to the repaired drive. If there are more areas that are bad than can be catalogued in the fixed area of the drive that keeps track of bad sectors, the drive must be thrown away. This can take a long time depending on the size of the drive. What this will do, besides overwriting all data, is tell the drive to map out any bad areas of the drive that can no longer safely hold data (the drive actually does this part itself). This WILL wipe out all information on the drive, which is one of the reasons to clone the drive, first. Choose the faulty drive and do a single pass Secure Erase. Boot to the newly created clone and run Disk Utility. The only way to attempt to fix such an issue is to first clone your drive an external drive so you first have a full, and duplicate backup.
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