The answer is the TRIM command was issued, causing the SSD to erase the freed blocks. This occurs because TRIM is a feature that allows the operating system to inform the SSD’s controller which data blocks are no longer in use, prompting the drive to physically erase those blocks during idle time or before shutdown. When the suspect deleted files and the laptop was turned off for 24 hours, the SSD likely completed the TRIM operation, overwriting the deleted data with zeros and making it unrecoverable even with a bit-for-bit forensic image. On the CHFI exam, this question tests your understanding of how solid-state drives differ from traditional hard drives in digital forensics—a common trap is assuming deleted files remain recoverable on SSDs as they would on HDDs. Remember the memory tip: “TRIM trashes the trace,” meaning the drive proactively wipes freed space, so always check if TRIM was enabled before expecting to recover deleted evidence from an SSD.
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.
An investigator acquires an SSD from a laptop that has been turned off for 24 hours. The suspect recently deleted several incriminating files. Using a forensic imager, the investigator creates a bit-for-bit copy. However, when analyzing the image, the deleted files' data appears to be zeros. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The TRIM command was issued, causing the SSD to erase the freed blocks
Many SSDs implement TRIM, which instructs the controller to erase blocks that are no longer in use. If the OS issued TRIM commands before shutdown, the deleted data may have been physically erased.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The files were stored in the paging file, which is volatile
Why it's wrong here
Paging file is on disk, not volatile.
✗
The SSD controller performed wear leveling, moving data to unallocated blocks
Why it's wrong here
Wear leveling moves data but does not zero out deleted files.
✗
The imaging tool incorrectly interpreted the data due to encryption
Why it's wrong here
Encryption would not result in zeros; it would produce ciphertext.
✓
The TRIM command was issued, causing the SSD to erase the freed blocks
Why this is correct
Correct. TRIM can cause permanent loss of deleted data on SSDs.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CHFI NAT questions on configuration and troubleshooting.
Storage Forensics and File System Analysis — This question tests Storage Forensics and File System Analysis — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The TRIM command was issued, causing the SSD to erase the freed blocks — Many SSDs implement TRIM, which instructs the controller to erase blocks that are no longer in use. If the OS issued TRIM commands before shutdown, the deleted data may have been physically erased.
What should I do if I get this CHFI question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CHFI NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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 →
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 examiner acquires a forensic image of an SSD from a suspect's laptop. The SSD was connected to a system with TRIM enabled. What challenge will the examiner most likely face when trying to recover deleted files?
medium
A.Wear leveling complicates data location
B.RAID striping interferes with imaging
C.The SSD is encrypted and cannot be imaged
✓ D.Deleted files may have been physically erased by TRIM
Why D: TRIM causes the SSD to erase blocks that are no longer in use, making file recovery difficult because data is physically erased.
Variation 2. During a forensic acquisition of a suspect's SSD, the analyst notices that the drive supports TRIM. Which of the following is the most important consideration when acquiring the drive to preserve deleted data?
medium
A.Perform a full format of the SSD before acquisition to clear any TRIM-related issues
✓ B.Use a hardware write-blocker and acquire the drive immediately to minimize TRIM interference
C.Enable TRIM in the forensic tool to ensure the drive is optimized before imaging
D.The SSD should be powered on for several hours to allow TRIM to complete before imaging
Why B: TRIM causes the SSD to erase deleted blocks immediately, making recovery impossible. Imaging the drive as soon as possible and using a write-blocker can prevent further TRIM commands.
Last reviewed: Jun 21, 2026
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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.
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