If you fail to wipe hard drive properly, you stand the risk of leaking highly sensitive data that might still be retrievable from some layer of it. Wiping hard drive should be undertaken such that the computer hardware is rendered completely unusable.
Mere erasing the data from the hard drive or formatting the drive is not enough for complete data destruction. Ideally, the drive should be physically destroyed to leave no scope for the drive being reused or donated or sold to a third person. The data shredding services own equipment that is designed to wipe a hard drive in totality. They employ a hydraulic crusher to destroy the hard drive, available both on-site and off the site. If the data is highly sensitive in nature, you can call one of these services at your place of work and get the wiping of hard drive accomplished on-site only. It is their business to ensure the confidentiality of your information and they use state-of-the art equipment to make sure of it.
You need to have the hard drive wipe so that there are no remnants. There is more space. You can just cover the data with the random patterns and zeroes with the Windows delete. But with the disc wipe, you make it unreadable.
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