Physical Destruction is the process of shredding hard drives, smartphones, printers, laptops and other storage media into tiny pieces by large mechanical shredders or using degaussers.
Degaussing is the process of reducing or eliminating an unwanted magnetic field (or data) stored on tape and disk media such as computer and laptop hard drives, diskettes, reels, cassettes and cartridge tapes. When exposed to the powerful magnetic field of a degausser, the magnetic data on a tape or hard disk is neutralized or erased. Degaussing is the guaranteed form of hard drive erasure, as such; it serves as the standard method of data destruction. Using the right degausser will guarantee that your information is no longer retrievable.
Data Erasure are the software-based method of securely overwriting data from any data storage device using zeros and ones onto all sectors of the device. By overwriting the data on the storage device, the data is rendered unrecoverable and achieves data sanitization.
Data wiping is the process of overwriting the data on a particular hard drive to such an extent that the original data is unreadable.