Data, File & Disk Eraser / Wiper

I am looking for a disk level utility that will erase data from a hard drive. It should delete similar to [login to view URL] It will also delete drive free space and be able to run as a service. Please only bid if you are serious, I will require and check reference. More details on request. Other Information I would pay via Paypal and GAF escrow I will leave good feed back if happy