Forensic Imaging Procedure
An incident responder needs to create a forensic image of a suspect hard drive. What is the correct procedure to ensure evidence integrity?
Quick Answer
This procedure is correct because it addresses the two things forensic imaging must guarantee simultaneously: that the original evidence is never altered, and that you can later prove it wasn't altered. A write blocker physically or logically prevents any write commands from reaching the suspect drive during imaging, which matters because even something as routine as an operating system mounting a drive can modify metadata like access timestamps, potentially compromising the evidence's integrity before analysis even begins. Creating a bit-for-bit image, rather than a simple file copy, ensures the copy captures everything on the drive, including deleted files, slack space, and unallocated space, not just the visible file system, since evidence relevant to an investigation is often hiding in exactly those overlooked areas. Computing a SHA-256 hash before imaging and again after gives you a cryptographic fingerprint of the source and the resulting image; if the two hashes match, that's mathematical proof the image is a perfect, unaltered duplicate, which is essential for the evidence to hold up under legal or disciplinary scrutiny. Skipping any one of these three elements, write protection, full bit-level copying, or hash verification, creates a gap an opposing party could use to challenge the evidence's authenticity. Whenever a question describes proper forensic imaging procedure, expect all three elements together, not just one.
⚠ Common exam trap
Watch out — candidates often think booting the system or simply copying files is sufficient, but the SSCP exam emphasizes that any write activity to the original evidence breaks the chain of custody and invalidates the forensic integrity.
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
✓
Use a write blocker, create a bit-for-bit image, and compute SHA-256 hash before and after imaging.
Forensic imaging requires a write blocker to prevent any modification to the original evidence, a bit-for-bit (sector-level) copy to capture all data including slack space and deleted files, and cryptographic hashing (SHA-256) both before and after imaging to verify that the image is an exact, unaltered duplicate of the source. This process ensures the integrity and admissibility of digital evidence in legal proceedings.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a write blocker, create a bit-for-bit image, and compute SHA-256 hash before and after imaging.
Why this is correct
Correct. Write blocker prevents writes, and hash verification ensures integrity.
- ✗
Boot the suspect system and use imaging software to copy data.
Why it's wrong here
Booting may alter evidence.
- ✗
Remove the drive and place it in anti-static bag, then ship to lab.
Why it's wrong here
Shipping without imaging may be necessary but does not ensure integrity at source.
- ✗
Connect the drive directly to forensic workstation, copy all files, and compute MD5 hash of copy.
Why it's wrong here
Direct connection may alter the drive.
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Same concept, more angles
2 more ways this is tested on SSCP
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. During a forensic investigation, an examiner creates a bit-for-bit copy of a hard drive using a write blocker. What is the purpose of using a write blocker?
medium- ✓ A.To prevent modification of the original evidence
- B.To encrypt the data during transfer
- C.To speed up the imaging process
- D.To verify the hash of the original drive
Why A: A write blocker is a hardware or software device that intercepts and blocks any write commands from the forensic workstation to the source drive, ensuring that the original evidence remains unaltered during acquisition. This is critical for maintaining the integrity and admissibility of digital evidence in legal proceedings, as any modification could compromise the chain of custody and forensic soundness.
Variation 2. An incident responder needs to create a forensic image of a suspect hard drive. Which of the following steps is ESSENTIAL to ensure the integrity of the evidence?
medium- A.Run an antivirus scan on the drive before imaging
- ✓ B.Use a write blocker to prevent modification of the original drive
- C.Boot the suspect system to verify it is functional
- D.Perform the imaging over the network to save time
Why B: Using a write blocker is essential because it ensures that no data can be written to the suspect hard drive during the imaging process, preserving the original evidence in a forensically sound state. Without a write blocker, any operating system or imaging tool could inadvertently modify metadata (e.g., access timestamps) or the file system, which would compromise the integrity and admissibility of the evidence in legal proceedings.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP 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 SSCP exam.