Quick Answer
The answer is using the hdparm command in Linux with the -N flag. This is correct because the Host Protected Area (HPA) is a reserved region on a hard drive that is hidden from the operating system by default, designed for vendor-specific data but often exploited by attackers to conceal forensic evidence. The hdparm -N command directly queries and modifies the HPA size, allowing an examiner to reveal the hidden sectors that standard disk utilities cannot see. On the Computer Hacking Forensic Investigator CHFI exam, this tests your understanding of low-level disk acquisition and anti-forensic techniques, often appearing as a scenario where a suspect has used HPA to hide data from tools like FTK or EnCase, which can only detect it when imaging at the device level. A common trap is assuming Windows-native tools can access HPA, but Linux is required for direct detection. Memory tip: think "HPA hides, hdparm unhides" — the -N flag reveals the true disk 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.
An analyst discovers that a Windows system has hidden data in the Host Protected Area (HPA) of the hard drive. Which tool or method can be used to detect and access the HPA?
Using the Windows Disk Management utility
Why wrong: Disk Management does not show HPA. HPA is hidden from the OS.
Using the hdparm command in Linux with the -N flag
hdparm -N /dev/sda shows the user-accessible capacity vs. native capacity, revealing HPA.
Using the Volatility framework
Why wrong: Volatility analyzes memory, not disk HPA.
Using the chkdsk command
Why wrong: chkdsk checks file system integrity, does not access HPA.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Using the hdparm command in Linux with the -N flag
HPA is a region of the disk that is normally hidden from the operating system. Tools like hdparm (Linux) or MBRTool can be used to detect and modify HPA settings. FTK and EnCase can also detect HPA when imaging at the device level.
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.
Using the Windows Disk Management utility
Why it's wrong here
Disk Management does not show HPA. HPA is hidden from the OS.
Using the hdparm command in Linux with the -N flag
Why this is correct
hdparm -N /dev/sda shows the user-accessible capacity vs. native capacity, revealing HPA.
Related concept
OSPF neighbours must agree on key parameters.
Using the Volatility framework
Why it's wrong here
Volatility analyzes memory, not disk HPA.
Using the chkdsk command
Why it's wrong here
chkdsk checks file system integrity, does not access HPA.
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.
Trap categories for this question
Command / output trap
Disk Management does not show HPA. HPA is hidden from the OS.
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: Using the hdparm command in Linux with the -N flag — HPA is a region of the disk that is normally hidden from the operating system. Tools like hdparm (Linux) or MBRTool can be used to detect and modify HPA settings. FTK and EnCase can also detect HPA when imaging at the device level.
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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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. An analyst retrieves a forensic image of a hard drive and discovers that the size reported by the operating system is smaller than the actual physical capacity. The extra space is not accessible through standard partition tools. This hidden area is MOST likely:
hardWhy B: The Host Protected Area (HPA) is an area on the hard drive that is not accessible through standard ATA commands. It can be used to hide data.
Last reviewed: Jun 21, 2026
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