This CHFI practice question tests your understanding of computer forensics fundamentals and process. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 needs to create a forensic image of a suspect's hard drive using FTK Imager. Which of the following image formats is MOST appropriate for maintaining evidence integrity and allowing compression?
ISO image format (.iso)
Why wrong: ISO is an optical disc image format, not suitable for hard drive forensics.
EnCase image format (.E01)
E01 supports compression, integrity checks, and is widely accepted in court.
Advanced Forensic Format (AFF)
Why wrong: AFF is used by some tools but FTK Imager primarily uses E01.
Raw/DD image (.dd)
Why wrong: Raw images do not support compression or metadata natively.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
EnCase image format (.E01)
FTK Imager natively supports the EnCase image format (.E01), which is the most appropriate choice because it maintains evidence integrity through embedded CRC32 and MD5/SHA-1 hash verification while also supporting optional compression. Unlike raw/DD images, .E01 files can be segmented and compressed without losing forensic integrity, making them ideal for both storage efficiency and court-admissible evidence.
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.
ISO image format (.iso)
Why it's wrong here
ISO is an optical disc image format, not suitable for hard drive forensics.
EnCase image format (.E01)
Why this is correct
E01 supports compression, integrity checks, and is widely accepted in court.
Related concept
Read the scenario before looking for a memorised answer.
Advanced Forensic Format (AFF)
Why it's wrong here
AFF is used by some tools but FTK Imager primarily uses E01.
Raw/DD image (.dd)
Why it's wrong here
Raw images do not support compression or metadata natively.
Common exam traps
The trap here is that candidates often choose Raw/DD (.dd) because it is the simplest and most universally accepted format, but they overlook that FTK Imager's .E01 format provides built-in compression and hash verification, which are critical for both integrity and practical storage management in forensic acquisitions.
Detailed technical explanation
The EnCase .E01 format uses a proprietary structure that stores data in 64-sector blocks (32 KB), each with its own CRC32 checksum, and an overall MD5 or SHA-1 hash at the file level. This allows partial verification during acquisition and ensures that any corruption is immediately detected. In real-world scenarios, examiners often use .E01 for multi-terabyte drives because compression can reduce storage requirements by 30-50% without affecting the ability to verify integrity, whereas raw images would require separate hash files and consume more space.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Computer Forensics Fundamentals and Process — This question tests Computer Forensics Fundamentals and Process — Read the scenario before looking for a memorised answer..
The correct answer is: EnCase image format (.E01) — FTK Imager natively supports the EnCase image format (.E01), which is the most appropriate choice because it maintains evidence integrity through embedded CRC32 and MD5/SHA-1 hash verification while also supporting optional compression. Unlike raw/DD images, .E01 files can be segmented and compressed without losing forensic integrity, making them ideal for both storage efficiency and court-admissible evidence.
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
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