- A
Hardware write blockers support faster transfer speeds than software blockers
Why wrong: Speed depends on the interface; hardware blockers do not inherently provide faster speeds.
- B
Hardware write blockers can be bypassed by malware on the forensic workstation
Why wrong: Hardware blockers are less susceptible to bypass; software blockers can be bypassed.
- C
Hardware write blockers operate at the physical layer and are OS-independent
This is a key advantage; they do not rely on the OS.
- D
Hardware write blockers provide a physical barrier that prevents any writes from reaching the suspect drive
They physically block write commands at the hardware level.
- E
Hardware write blockers are cheaper than software solutions
Why wrong: Hardware blockers are generally more expensive.
CHFI Computer Forensics Fundamentals and Process Practice Question
This CHFI practice question tests your understanding of computer forensics fundamentals and process. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 TWO of the following are valid reasons for using a hardware write blocker over a software write blocker? (Select two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Hardware write blockers operate at the physical layer and are OS-independent
Option C is correct because hardware write blockers operate at the physical layer of the OSI model, intercepting SATA/IDE/PATA commands before they reach the operating system. This makes them completely OS-independent, so they work identically on Windows, Linux, or macOS without requiring any kernel-mode drivers or OS-specific configurations. In contrast, software write blockers rely on the OS storage stack and can be affected by OS-level bugs or driver conflicts.
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.
- ✗
Hardware write blockers support faster transfer speeds than software blockers
Why it's wrong here
Speed depends on the interface; hardware blockers do not inherently provide faster speeds.
- ✗
Hardware write blockers can be bypassed by malware on the forensic workstation
Why it's wrong here
Hardware blockers are less susceptible to bypass; software blockers can be bypassed.
- ✓
Hardware write blockers operate at the physical layer and are OS-independent
Why this is correct
This is a key advantage; they do not rely on the OS.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Hardware write blockers provide a physical barrier that prevents any writes from reaching the suspect drive
Why this is correct
They physically block write commands at the hardware level.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Hardware write blockers are cheaper than software solutions
Why it's wrong here
Hardware blockers are generally more expensive.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that hardware write blockers are faster than software blockers, when in reality the hardware bridge introduces overhead, and the key advantage is OS independence and physical write prevention, not speed.
Detailed technical explanation
How to think about this question
Hardware write blockers implement the ATA/ATAPI-6 Security Feature Set or SCSI commands to intercept WRITE commands at the bus level, using a dedicated microcontroller that filters out write commands (e.g., WRITE DMA, WRITE SECTORS) while passing read commands (e.g., READ DMA, IDENTIFY DEVICE) transparently. In a real-world scenario, when imaging a drive with bad sectors, a hardware blocker ensures that the drive's internal firmware does not reallocate sectors (a write operation) during the read attempt, preserving the original evidence state. The write blocker's physical barrier is achieved by physically disconnecting the write line (e.g., pin 13 on a PATA cable) or using a bridge chip that never asserts the write strobe signal.
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 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Computer Forensics Fundamentals and Process — study guide chapter
Learn the concepts, then practise the questions
- →
Computer Forensics Fundamentals and Process practice questions
Targeted practice on this topic area only
- →
All CHFI questions
1,000 questions across all exam domains
- →
Computer Hacking Forensic Investigator CHFI study guide
Full concept coverage aligned to exam objectives
- →
CHFI practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CHFI practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Computer Forensics Investigation Process practice questions
Practise CHFI questions linked to Computer Forensics Investigation Process.
Computer Forensics Fundamentals and Process practice questions
Practise CHFI questions linked to Computer Forensics Fundamentals and Process.
Storage Forensics and File System Analysis practice questions
Practise CHFI questions linked to Storage Forensics and File System Analysis.
Incident Response and First Responder Skills practice questions
Practise CHFI questions linked to Incident Response and First Responder Skills.
Computer Forensics Lab practice questions
Practise CHFI questions linked to Computer Forensics Lab.
Evidence Acquisition and Duplication practice questions
Practise CHFI questions linked to Evidence Acquisition and Duplication.
OS and Network Forensics practice questions
Practise CHFI questions linked to OS and Network Forensics.
OS and File System Forensics practice questions
Practise CHFI questions linked to OS and File System Forensics.
Application, Email and Cloud Forensics practice questions
Practise CHFI questions linked to Application, Email and Cloud Forensics.
Mobile and Malware Forensics practice questions
Practise CHFI questions linked to Mobile and Malware Forensics.
Network and Cloud Forensics practice questions
Practise CHFI questions linked to Network and Cloud Forensics.
Database and Application Forensics practice questions
Practise CHFI questions linked to Database and Application Forensics.
Practice this exam
Start a free CHFI practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CHFI question test?
Computer Forensics Fundamentals and Process — This question tests Computer Forensics Fundamentals and Process — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Hardware write blockers operate at the physical layer and are OS-independent — Option C is correct because hardware write blockers operate at the physical layer of the OSI model, intercepting SATA/IDE/PATA commands before they reach the operating system. This makes them completely OS-independent, so they work identically on Windows, Linux, or macOS without requiring any kernel-mode drivers or OS-specific configurations. In contrast, software write blockers rely on the OS storage stack and can be affected by OS-level bugs or driver conflicts.
What should I do if I get this CHFI 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.