# Data Destruction and Media Sanitization One-sentence definition: Irreversibly remove data from media using methods appropriate to sensitivity and media type. ## Key Facts - Methods: clear, purge (crypto-erase, degauss), destroy (shred/incinerate). - Verify: sampling, certificates of destruction, chain-of-custody. - Consider SSD limitations; prefer crypto-erase for speed. - Third-party handling requires contracts and oversight. - **Verify:** check official (ISC)² CBK and current exam outline. ## Exam Relevance - Choose method based on data sensitivity and media. **Mnemonic:** “**Clear, purge, destroy**.” ## Mini Scenario Q: Retiring encrypted SSDs—fastest secure method? A: Crypto-erase (key destruction) + verify. ## Revision Checklist - Three method tiers. - Verification evidence. - SSD note. ## Related [[Physical Security Operations (Perimeter Facility DC)]] · [[Chain of Custody for Digital Evidence]] · [[Third-Party Operational Risk and Managed Services]] · [[Configuration Management and Drift Control]] · [[Privacy Impact Assessments (PIA) in Testing)]] · [[Domain 7 - Index]]