Does anyone know how to

wipe off the bad sectors from hard disk permanently??

its my 80 gigs hdd, it has developed 16 kb’s of bad sector, i have tried various things in past lik changing drive space, low level formatting using DM etc but they keep on coming back after few days…i can exchange it with a new one but taking a backup is a huge task, but i’v gota do what i’v gota do if there is no other way…id lik to try few things more before i really screw this drive so help me out…