The answer is shredding the drives into small pieces, as this method provides the highest assurance that data cannot be recovered. Shredding physically destroys the platters inside hard drives, eliminating any possibility of reading residual magnetic data from HDDs or solid-state data from SSDs, even with advanced forensic tools like electron microscopy. On the CISSP exam, this question tests your understanding of the domain covering asset disposal and media sanitization, where the key distinction is between logical methods like degaussing (which fails on SSDs) and physical destruction. A common trap is choosing degaussing because it works on magnetic media, but it does not affect SSDs and leaves the drive structure intact. Remember the memory tip: “Shred to dead” — if you need the highest assurance, physical destruction is the only way to guarantee data is unrecoverable across all storage technologies.
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 company is decommissioning a data center and needs to dispose of hard drives that contained highly confidential financial data. Which of the following methods provides the HIGHEST assurance that data cannot be recovered?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Shredding the drives into small pieces
Shredding the drives into small pieces physically destroys the platters, making data recovery impossible regardless of the storage technology (e.g., HDD vs. SSD). This method provides the highest assurance because it eliminates any possibility of reading residual magnetic or solid-state data, even with advanced forensic tools like electron microscopy.
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.
✗
Overwriting the drives with multiple passes of random data
Why it's wrong here
Multiple passes reduce recoverability but may not be as assured as physical destruction for highly confidential data.
✓
Shredding the drives into small pieces
Why this is correct
Physical destruction makes data recovery physically impossible.
Related concept
Read the scenario before looking for a memorised answer.
✗
Degaussing the drives
Why it's wrong here
Degaussing may not be effective on solid-state drives and can damage the drive, but some data may remain.
✗
Overwriting the drives with a single pass of zeros
Why it's wrong here
A single pass may leave recoverable data due to magnetic remanence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose degaussing or multi-pass overwriting because they are familiar with these methods, but they fail to recognize that physical destruction is the only method that guarantees data irretrievability across all drive types, especially SSDs.
Detailed technical explanation
How to think about this question
Physical destruction, such as shredding to particles smaller than 2 mm, ensures that the magnetic domains or NAND flash cells are fragmented beyond any practical reassembly. For SSDs, overwriting is unreliable due to wear leveling and over-provisioning, which can leave residual data in unaddressable blocks; degaussing is ineffective because SSDs lack magnetic platters. In high-security environments (e.g., government or financial), NIST SP 800-88 recommends shredding or incineration for media containing top-secret data.
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: Shredding the drives into small pieces — Shredding the drives into small pieces physically destroys the platters, making data recovery impossible regardless of the storage technology (e.g., HDD vs. SSD). This method provides the highest assurance because it eliminates any possibility of reading residual magnetic or solid-state data, even with advanced forensic tools like electron microscopy.
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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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.
Question Discussion
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