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CompTIA Security+ study material · question 185 of 611

A self-encrypting drive must be sanitised in minutes rather than hours. Which technique achieves this?

  1. Degaussing
  2. A quick format
  3. Cryptographic erase of the media encryption key
  4. A single-pass overwrite
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Answer: C. Cryptographic erase of the media encryption key

Destroying the key leaves only unrecoverable ciphertext, which sanitises the whole device almost instantly.

Source: NIST SP 800-88 Rev. 1 (NIST) — SP 800-88 Rev. 1 § 2.6 Use of Cryptography and Cryptographic Erase

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