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CISSP study material · question 151 of 500

An asset manager can apply either clear or purge to a batch of drives being redeployed, at similar cost. What does NIST SP 800-88 Rev. 2 advise?

  1. Use purge, since it should be preferred to clear wherever it is available.
  2. Use either, since both give equivalent protection against laboratory recovery.
  3. Use clear, since purge unnecessarily risks rendering the media unusable.
  4. Use clear first and then purge, since the methods are cumulative.
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Answer: A. Use purge, since it should be preferred to clear wherever it is available.

Purge defeats even state-of-the-art laboratory recovery while leaving the media potentially reusable, and SP 800-88 says to use purge rather than clear when it is possible.

Source: NIST SP 800-88 Rev. 2 (NIST) — SP 800-88 Rev. 2 > 3.1.2 Purge Sanitization Method

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