I need a solution that will wipe a disk (like Killdisk)

I am hoping Symantec has a product that can help us achive our goal of writing over and confirming data is destroyed on old hard drives the we need to send back to an outside leasing company, without destroying the harddive it's self. We used Killdisk for a little while but we have had some issues and hoping to move to a new solution.

Thanks