Quick Answer
The answer is hdparm, the Linux utility that detects a Host Protected Area by comparing the reported device size with the actual number of sectors. This works because hdparm queries the ATA command set directly, using the `-N` flag to display the HPA configuration; if the HPA is active, the tool reveals a reduced sector count, exposing the hidden area where a rootkit may reside. On the Computer Hacking Forensic Investigator CHFI exam, this tests your ability to identify anti-forensic techniques that conceal data beyond the operating system’s view, often appearing in questions about disk geometry manipulation or rootkit detection. A common trap is confusing HPA detection with tools like `fdisk` or `parted`, which only report partition tables, not the raw ATA security features. Memory tip: think “hdparm -N reveals the hidden ‘N’umber of sectors,” linking the flag directly to the concept of comparing reported versus actual size.
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.
During a forensic analysis of a compromised server, you discover that a rootkit has hidden itself by modifying the HPA (Host Protected Area) of the hard disk. Which tool can detect the presence of an HPA by comparing the reported size with the actual number of sectors?
smartctl
Why wrong: smartctl reads SMART data but does not directly report HPA.
dd
Why wrong: dd is a data duplication tool, not designed to detect HPA.
fdisk
Why wrong: fdisk manages partition tables but does not detect HPA at the ATA level.
hdparm
hdparm can read ATA settings, including HPA and DCO, to detect hidden areas.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
hdparm
The hdparm tool in Linux can query the ATA security features, including HPA. The command `hdparm -N /dev/sda` displays the HPA settings and can reveal if an HPA is active by showing a reduced device size.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
smartctl
Why it's wrong here
smartctl reads SMART data but does not directly report HPA.
dd
Why it's wrong here
dd is a data duplication tool, not designed to detect HPA.
fdisk
Why it's wrong here
fdisk manages partition tables but does not detect HPA at the ATA level.
hdparm
Why this is correct
hdparm can read ATA settings, including HPA and DCO, to detect hidden areas.
Related concept
OSPF neighbours must agree on key parameters.
Common exam traps
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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. OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related CHFI OSPF questions on adjacency and route selection.
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FAQ
Storage Forensics and File System Analysis — This question tests Storage Forensics and File System Analysis — OSPF neighbours must agree on key parameters..
The correct answer is: hdparm — The hdparm tool in Linux can query the ATA security features, including HPA. The command `hdparm -N /dev/sda` displays the HPA settings and can reveal if an HPA is active by showing a reduced device size.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related CHFI OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 21, 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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