The answer is to acquire a logical image from the running operating system. This is the best method because when a self-encrypting drive acquisition powered on occurs, the drive’s hardware encryption key is already loaded in memory, allowing the OS to present decrypted data. Taking a logical image from the live system captures files and metadata without cutting power, which would immediately lock the SED and require re-authentication, potentially altering the evidence state. On the CHFI exam, this tests your understanding of how SEDs differ from software encryption—the trap is thinking you need to remove the drive or use a hardware imager, but that would break the decryption context. Remember the key: if it’s powered on and logged in, stay live; never pull the plug on an SED.
CHFI Evidence Acquisition and Duplication Practice Question
This CHFI practice question tests your understanding of evidence acquisition and duplication. 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.
You are acquiring a laptop with a self-encrypting drive (SED) that is powered on and logged in. What is the best method to acquire the drive while preserving encrypted data?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Acquire a logical image from the running operating system
When a self-encrypting drive (SED) is powered on and logged in, the drive's hardware encryption key is already loaded and the data is accessible through the operating system. The best method to preserve the encrypted data in its decrypted state is to acquire a logical image from the running OS, which captures files and metadata without powering off the drive and losing the decryption context. Removing power or rebooting would cause the SED to lock, requiring the authentication key again and potentially altering the data state.
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.
✗
Remove the drive and use a forensic bridge that supports SED
Why it's wrong here
The drive may lock when removed from the laptop.
✗
Power off the laptop and image the drive using a hardware write blocker
Why it's wrong here
This would capture encrypted data, not decrypted.
✓
Acquire a logical image from the running operating system
Why this is correct
Since the system is logged in, the data is decrypted and accessible.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Boot from a forensic live CD and image the drive
Why it's wrong here
The drive may be locked; the encryption key is in memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the misconception that a hardware write blocker or forensic bridge can always acquire a drive intact, but with SEDs, the critical factor is the encryption state—powering off or removing the drive locks it, making the data inaccessible regardless of write-blocking hardware.
Detailed technical explanation
How to think about this question
Self-encrypting drives (SEDs) use a hardware-based encryption engine with a media encryption key (MEK) that is wrapped by an authentication key (AK). When the system is powered on and logged in, the AK is presented (e.g., via OPAL or eDrive protocols) and the MEK is loaded into the drive's volatile memory; a power loss clears this memory, locking the drive. In real-world forensic practice, if the SED is unlocked, a logical acquisition (e.g., using FTK Imager or dd over a network) preserves the decrypted state without risking the drive locking, whereas physical acquisition after power-off yields only encrypted blocks.
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 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.
Evidence Acquisition and Duplication — This question tests Evidence Acquisition and Duplication — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Acquire a logical image from the running operating system — When a self-encrypting drive (SED) is powered on and logged in, the drive's hardware encryption key is already loaded and the data is accessible through the operating system. The best method to preserve the encrypted data in its decrypted state is to acquire a logical image from the running OS, which captures files and metadata without powering off the drive and losing the decryption context. Removing power or rebooting would cause the SED to lock, requiring the authentication key again and potentially altering the data state.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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