As part of our media destruction policy, hard drives that are no longer in use are securely transported from the data centre to our secure site office where they are stored in a locked cabinet. In order to reduce costs, we do not destroy the hard disks on an ad-hoc basis, rather we wait until we have a number of hard disks awaiting destruction before we contract a hard drive shredding company to destroy these disks and provide us with a certificate of destruction.