You are correct you can just replace the hard disk and start a new Time Machine backup. To be honest if the WD HD is more than 3 years old, I would just replace it with a new one. Someone technical can make an assessment of what the HD problem is by running diagnostic tests. While it can also make any bad sector (physical) errors not addressable, it may be a sign that the hard disk is starting to die, and you run the risk that more bad sectors to develop in the future. Reformatting the disk would fix any non physical errors. The current errors on the disk could be as a result of unplugging the disk while it was still writing data or other software errors, or it could be that the disk is starting to fail. I would recommend that reformatting a disk is done by someone that understands the process. Be careful, if you are not sure what you are doing you could inadvertently reformat your internal HD rather than your external backup WD drive.
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