Which data-destruction technique relies on a very strong magnetic field to scramble the magnetic domains on hard disk drives and magnetic tape, rendering the stored data unrecoverable?
Degaussing
Drilling holes through the drive
Encrypting the drive with BitLocker
Low-level formatting
Degaussing uses a high-intensity magnetic field to randomize the magnetic domains that represent bits on magnetic media. This purges the data and usually makes the drive unusable. It does not work on non-magnetic storage such as solid-state drives (SSDs). NIST SP 800-88 and other industry sources list degaussing as an approved purge method for magnetic media but ineffective for flash-based media.
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