Quick Answer
The answer is HPA, ADS, and slack space. These three techniques are common data hiding methods in storage forensics because they exploit areas of a storage device that are not visible to the standard operating system or file system. The Host Protected Area (HPA) is a reserved region on an ATA drive that bypasses normal BIOS and OS enumeration, while Alternate Data Streams (ADS) allow data to be appended to a file in NTFS without affecting its visible size, and slack space—comprising file slack and volume slack—is the unused residual area between the end of a file and the end of the allocated cluster. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your ability to distinguish between legitimate forensic artifacts and actual hiding spots; a common trap is confusing ADS with simple file attributes or assuming slack space only refers to RAM. For a quick memory tip, remember the acronym HAS: HPA, ADS, and Slack space—these three hide data where the OS does not look.
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.
Which three of the following are common techniques used to hide data on a storage device? (Choose THREE.)
File system journaling
Why wrong: Journaling is for consistency, not hiding.
Host Protected Area (HPA)
Correct: HPA hides data from the OS.
Alternate Data Streams (ADS) in NTFS
Correct: ADS can hide data attached to files.
TRIM command
Why wrong: TRIM is for SSD performance, not hiding.
Slack space (file slack, volume slack)
Correct: Slack space can hide data.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Host Protected Area (HPA)
HPA, ADS, and slack space are well-known data hiding techniques.
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.
File system journaling
Why it's wrong here
Journaling is for consistency, not hiding.
Host Protected Area (HPA)
Why this is correct
Correct: HPA hides data from the OS.
Related concept
OSPF neighbours must agree on key parameters.
Alternate Data Streams (ADS) in NTFS
Why this is correct
Correct: ADS can hide data attached to files.
Related concept
OSPF neighbours must agree on key parameters.
TRIM command
Why it's wrong here
TRIM is for SSD performance, not hiding.
Slack space (file slack, volume slack)
Why this is correct
Correct: Slack space can hide data.
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 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.
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: Host Protected Area (HPA) — HPA, ADS, and slack space are well-known data hiding techniques.
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
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Variation 1. A forensic investigator recovers a hard drive from a suspect's computer. The drive is detected as 120 GB in BIOS, but forensic tools report only 100 GB of addressable space. Which data hiding technique is MOST likely being used?
mediumWhy C: Host Protected Area (HPA) is a region on ATA drives that can be hidden from the OS by using the SET MAX ADDRESS command. It is commonly used for hiding data.
Last reviewed: Jun 21, 2026
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