Quick Answer
The best approach for acquiring a drive with bad sectors is to use ddrescue to recover as much data as possible. This tool is specifically engineered for forensic imaging of failing media, employing a sophisticated read-retry algorithm that logs errors and attempts recovery from multiple angles, including reverse reads and splitting the drive into good and bad regions. Unlike dd, which aborts or produces corrupted output upon encountering a bad sector, ddrescue maximizes data extraction while preserving a detailed map of unrecoverable areas. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your understanding of forensic acquisition tools and their error-handling capabilities; a common trap is choosing dd because it is more familiar, but the exam emphasizes tools that prioritize data integrity over speed. Remember the memory tip: "dd is dead on bad blocks, ddrescue rescues the rest."
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.
During a forensic acquisition, you notice that the target drive has bad sectors. What is the best approach to acquire the drive?
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.
Use dd with a higher block size to skip bad sectors
Why wrong: dd will abort on errors.
Use ddrescue to recover as much data as possible
ddrescue is designed for failing drives.
Use FTK Imager and ignore the errors
Why wrong: Ignoring errors is not forensically sound.
Perform a physical acquisition by removing platters
Why wrong: This is destructive and not recommended.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use ddrescue to recover as much data as possible
B is correct because ddrescue is specifically designed to handle media with bad sectors by using a sophisticated read-retry algorithm that logs errors and attempts recovery from multiple angles, including reverse reads and splitting the drive into good and bad regions. Unlike dd, which will abort or produce corrupted output on encountering a bad sector, ddrescue maximizes data recovery while preserving a map of unrecoverable areas.
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.
Use dd with a higher block size to skip bad sectors
Why it's wrong here
dd will abort on errors.
Use ddrescue to recover as much data as possible
Why this is correct
ddrescue is designed for failing drives.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Use FTK Imager and ignore the errors
Why it's wrong here
Ignoring errors is not forensically sound.
Perform a physical acquisition by removing platters
Why it's wrong here
This is destructive and not recommended.
Common exam traps
EC-Council often tests the misconception that dd can handle bad sectors by adjusting block size, but the trap is that dd lacks any error recovery algorithm and will simply fail or produce incomplete data, whereas ddrescue is the proper tool for forensic acquisition of damaged media.
Detailed technical explanation
ddrescue operates by first reading the drive in large blocks to quickly map good regions, then retrying bad areas with smaller blocks and reverse reads to recover marginal sectors; it generates a log file (mapfile) that tracks which sectors are recovered, allowing the process to be resumed or refined later. In a real-world scenario, a forensic examiner might use ddrescue with multiple passes (e.g., --retrim --direct) to handle drives with intermittent bad sectors, ensuring the chain of custody is maintained while maximizing evidence recovery.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Evidence Acquisition and Duplication — This question tests Evidence Acquisition and Duplication — Read the scenario before looking for a memorised answer..
The correct answer is: Use ddrescue to recover as much data as possible — B is correct because ddrescue is specifically designed to handle media with bad sectors by using a sophisticated read-retry algorithm that logs errors and attempts recovery from multiple angles, including reverse reads and splitting the drive into good and bad regions. Unlike dd, which will abort or produce corrupted output on encountering a bad sector, ddrescue maximizes data recovery while preserving a map of unrecoverable areas.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
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 acquisition of a live Linux server, the forensic examiner runs the following command: # dd if=/dev/sda of=/mnt/evidence/disk.dd conv=noerror,sync bs=4k. Which TWO statements are true about this acquisition?
mediumWhy C: Option C is correct because the `conv=noerror,sync` parameter tells `dd` to continue reading even if a read error occurs, and to pad the output block with zeros to maintain the correct offset and size. This ensures the image remains usable for analysis despite bad sectors on the source disk.
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Last reviewed: Jun 30, 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.
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