Quick Answer
The answer is degaussing, physical shredding, and incineration. Degaussing works by exposing the drive to a powerful magnetic field that disrupts the magnetic domains on the platters, effectively erasing all data at the atomic level. Physical shredding destroys the platters themselves, making data recovery impossible regardless of the magnetic state, while incineration melts the media beyond any readable form. On the CISSP exam, this question tests your understanding of the Domain 2 asset security objective on media sanitization, often appearing as a multiple-select trap where candidates confuse overwriting—which is ineffective for magnetic drives due to residual magnetism—with these destructive methods. A common memory tip is to remember that magnetic hard drives require either a magnetic kill (degaussing) or a physical kill (shredding or burning); simple deletion or overwriting leaves recoverable traces. For the exam, think “destroy the field or destroy the platter” to lock in the three valid methods.
This CISSP practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE of the following are valid methods for securely disposing of magnetic hard drives?
Deleting files and emptying recycle bin
Why wrong: Data remains on disk.
Physical shredding
Destroys platters.
Overwriting with random data (multiple passes)
Makes recovery difficult.
Degaussing
Destroys magnetic domain.
Quick formatting
Why wrong: Data remains recoverable.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Physical shredding
Physical shredding (B) destroys the platters, making data recovery impossible regardless of the magnetic state. This is a valid method for secure disposal because it physically prevents any read/write head from accessing the data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Deleting files and emptying recycle bin
Why it's wrong here
Data remains on disk.
Physical shredding
Why this is correct
Destroys platters.
Related concept
Read the scenario before looking for a memorised answer.
Overwriting with random data (multiple passes)
Why this is correct
Makes recovery difficult.
Related concept
Read the scenario before looking for a memorised answer.
Degaussing
Why this is correct
Destroys magnetic domain.
Related concept
Read the scenario before looking for a memorised answer.
Quick formatting
Why it's wrong here
Data remains recoverable.
Common exam traps
The trap here is that candidates often confuse logical deletion (A, E) with secure erasure, or assume that multiple overwrites are always required, when in fact degaussing and physical destruction are the only methods that guarantee data is irrecoverable from magnetic media.
Detailed technical explanation
Overwriting with multiple passes (C) is effective because modern hard drives use perpendicular recording and may have hidden sectors (e.g., G-List or P-List) that single-pass overwrites cannot reach; however, NIST SP 800-88 recommends a single overwrite for most drives due to high areal density. Degaussing (D) works by exposing the drive to a strong magnetic field (typically >1000 Oersteds) that randomizes the magnetic domains, but it can also damage the drive's controller electronics, rendering the drive unusable.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
The correct answer is: Physical shredding — Physical shredding (B) destroys the platters, making data recovery impossible regardless of the magnetic state. This is a valid method for secure disposal because it physically prevents any read/write head from accessing the data.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CISSP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISSP exam.
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