The answer is that the rebuild process may overwrite data in slack space and previously unallocated clusters, which is the most significant forensic challenge. This occurs because a RAID 5 rebuild recalculates and writes parity stripes across all disks, including areas that previously held deleted file remnants or slack space. Since the rebuild treats the entire array as a single logical volume, it can overwrite the very unallocated clusters and slack space where a forensic analyst would typically recover deleted files, effectively destroying that evidence. On the CHFI exam, this question tests your understanding of how RAID controller behavior complicates file recovery—a common trap is assuming a rebuild is a simple copy that leaves deleted data intact. Remember: RAID rebuild is a destructive write operation, not a read-only recovery. Memory tip: “Rebuild rewrites; recovery requires pre-rebuild images.”
CHFI Storage Forensics and File System Analysis Practice Question
This CHFI practice question tests your understanding of storage forensics and file system analysis. 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.
A forensic analyst is examining a RAID 5 array consisting of three disks. One disk has failed and has been replaced. The array is rebuilt automatically. However, the analyst needs to recover deleted files that existed before the rebuild. What is the MOST significant challenge in this scenario?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rebuild process may overwrite data in slack space and previously unallocated clusters
RAID rebuild writes parity and data across disks, potentially overwriting slack space and previously deleted file data. The rebuilt array may have altered the original data layout, complicating recovery.
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.
✗
File carving techniques do not work on RAID volumes
Why it's wrong here
Carving can work if data is not overwritten, but rebuild increases overwrite.
✓
The rebuild process may overwrite data in slack space and previously unallocated clusters
Why this is correct
Rebuilding RAID 5 writes new parity and data, overwriting free space and slack.
Related concept
Read the scenario before looking for a memorised answer.
✗
The file system becomes corrupted after rebuild
Why it's wrong here
RAID rebuild does not corrupt file system; it restores redundancy.
✗
The RAID controller encrypts data, preventing direct disk access
Why it's wrong here
RAID 5 does not inherently encrypt.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Storage Forensics and File System Analysis — This question tests Storage Forensics and File System Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The rebuild process may overwrite data in slack space and previously unallocated clusters — RAID rebuild writes parity and data across disks, potentially overwriting slack space and previously deleted file data. The rebuilt array may have altered the original data layout, complicating recovery.
What should I do if I get this CHFI question wrong?
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An analyst is examining a RAID 5 array of three disks. One disk has failed and been replaced; the array is rebuilding. Which of the following is the most significant forensic challenge regarding data acquisition from this array?
hard
A.The failed disk cannot be imaged because it is physically damaged
✓ B.The rebuild process may overwrite unallocated space or remnants of deleted files
C.RAID 5 arrays cannot be imaged using traditional tools like dd
D.The array must be imaged while degraded to preserve evidence
Why B: RAID 5 distributes parity across disks. During rebuild, write operations occur that can overwrite deleted data or alter metadata, complicating acquisition.
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This CHFI practice question is part of Courseiva's free EC-Council 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 CHFI exam.
Question Discussion
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