Need Seagate HDD bad sector remover software

As the title says, I have a Seagate Hard Disk Drive but it was damaged and a friend of mine somehow made it work.
He told me that I must remove some bad sectors, and it will be as new but smaller.
I have no idea how to do this, but I am sure with your help I will make this Hard Drive work.
So please help me to get Seagate HDD bad sector remover software.
Any help or suggestion would be appreciated.
