If you go ahead and format the hard drive, fromatting will lock out these bad sectors.
Bad sectors can indicate that the hard drive is wearing out especially if the number of bad sectors increase as you use the hard disk and if this is the case then back up your data regularly so you won't lose your data when this hard drives fail completely. I would consider retiring this hard drive ASAP.
Bad sectors are usually cause by the magnetic oxide layer on the platters wearing out or breaking down.
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