A technician needs to permanently and securely erase data from several magnetic hard disk drives (HDDs) that contain sensitive information. The drives will not be reused. Which of the following data destruction methods uses a powerful magnetic field to render the data unrecoverable?
Low-level formatting
Overwriting
Degaussing
Shredding
Degaussing is the correct method for using a powerful magnetic field to destroy data on magnetic storage media like hard disk drives (HDDs) and tapes. This process completely and permanently neutralizes the magnetic fields on the drive's platters, rendering the data unrecoverable and the drive itself unusable. Shredding physically destroys the drive but doesn't use magnets. Low-level formatting is a process done at the factory to prepare the disk surface and is not a secure data destruction method available to end-users. Overwriting (or wiping) writes new data over the old data but does not use an external magnetic field.
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