ISC2 Certified in Cybersecurity (CC) Practice Question
When retiring magnetic backup tapes that will not be reused, which destruction technique should be applied to guarantee the recorded data can never be reconstructed?
Performing a quick format of each tape
Setting tape access permissions to read-only
Compressing the tape data before storage
Degaussing the tapes with a powerful electromagnet
Magnetic tapes store information by orienting tiny magnetic domains on the tape surface. Degaussing passes the media through an intense, alternating magnetic field that randomizes these domains, erasing servo tracks and data so thoroughly that the tape cannot be read again. In contrast, a quick format only removes file allocation information, leaving most user data recoverable. Compressing data does not erase it at all, and merely setting the tape to read-only changes permissions without affecting the underlying bits. Therefore, degaussing is the only option listed that makes the data truly unrecoverable.
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ISC2 Certified in Cybersecurity (CC)
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