The answer is degaussing the hard drive. This method uses a powerful magnetic field to scramble the magnetic domains on the platters, making PHI data sanitization complete and irrecoverable even with advanced forensic tools, which directly satisfies HIPAA’s disposal standards under 45 CFR §164.310(d)(2)(i). On the CISSP exam, this question tests your understanding of the difference between clearing, purging, and destroying media; degaussing is a form of purging that physically destroys the magnetic media’s ability to store data, unlike overwriting which can leave residual traces. A common trap is confusing degaussing with simple deletion or formatting, which only remove file pointers and leave data recoverable. Remember the memory tip: “Degauss destroys domains” — if the drive is magnetic, degaussing guarantees the data is gone for good, making it the only compliant choice for PHI on decommissioned servers.
CISSP Asset Security Practice Question
This CISSP practice question tests your understanding of asset security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A healthcare organization must decommission a server containing protected health information (PHI). Which data sanitization method ensures the data is irrecoverable while complying with regulatory requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Degauss the hard drive
Degaussing uses a strong magnetic field to disrupt the magnetic domains on a hard drive, rendering the data irrecoverable even with advanced forensic tools. For a healthcare organization handling PHI, degaussing meets regulatory requirements like HIPAA's disposal standards (45 CFR §164.310(d)(2)(i)) by ensuring data cannot be reconstructed. Unlike other methods, degaussing physically destroys the magnetic media's ability to store data, making it a definitive sanitization technique for magnetic hard drives.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Reformat the hard drive with a quick format
Why it's wrong here
Reformatting does not remove data; it only marks space as available.
✓
Degauss the hard drive
Why this is correct
Degaussing destroys magnetic data and is approved for PHI disposal.
Related concept
Read the scenario before looking for a memorised answer.
✗
Physically shred the hard drive
Why it's wrong here
Physical shredding is acceptable but not the only method; degaussing is also compliant and allows reuse.
✗
Overwrite the hard drive with a single pass of zeros
Why it's wrong here
Single pass overwrite may not meet regulatory standards for PHI.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'overwriting with zeros' (clear) with 'degaussing' (purge), assuming a single pass is sufficient for PHI, but CISSP expects knowledge that regulatory compliance (e.g., HIPAA) mandates a purge-level sanitization for sensitive data, which degaussing provides by destroying the magnetic structure itself.
Detailed technical explanation
How to think about this question
Degaussing works by applying a coercive magnetic field (typically >10,000 Oersteds for modern hard drives) to randomize the magnetic domains on the platters, effectively erasing the servo tracks and rendering the drive inoperable. This method is irreversible and aligns with the 'purge' category in NIST SP 800-88 Rev. 1, which is required for media containing PHI. In a real-world scenario, a healthcare organization must ensure the degausser is certified for the drive's coercivity (e.g., a Type I degausser for high-coercivity drives) to avoid incomplete erasure, and must document the process for compliance audits.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Asset Security — This question tests Asset Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Degauss the hard drive — Degaussing uses a strong magnetic field to disrupt the magnetic domains on a hard drive, rendering the data irrecoverable even with advanced forensic tools. For a healthcare organization handling PHI, degaussing meets regulatory requirements like HIPAA's disposal standards (45 CFR §164.310(d)(2)(i)) by ensuring data cannot be reconstructed. Unlike other methods, degaussing physically destroys the magnetic media's ability to store data, making it a definitive sanitization technique for magnetic hard drives.
What should I do if I get this CISSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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