Quick Answer
The answer is Alternate Data Streams, slack space, and Host Protected Area. These are three distinct techniques used to hide data on a hard drive by exploiting file system and hardware structures. Alternate Data Streams (ADS) conceal data within NTFS file metadata, invisible to standard directory listings, while slack space hides data in the unused bytes between the end of a file and the end of its allocated cluster. The Host Protected Area (HPA) is a reserved region on ATA drives, set via special ATA commands, that remains hidden from the operating system and standard forensic tools. On the CHFI exam, this question tests your ability to distinguish hiding techniques from recovery or verification methods—common traps include confusing file carving (a recovery technique) or hashing (integrity verification) with actual data concealment. A useful memory tip is to remember the acronym “ASH”: Alternate Data Streams, Slack space, and HPA—each exploits a different layer of the storage stack to keep data out of sight.
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 techniques used to hide data on a hard drive?
File carving
Why wrong: File carving recovers data, not hides it.
Host Protected Area (HPA)
HPA is a hidden area on ATA drives.
Slack space
Data can be hidden in file slack or volume slack.
Alternate Data Streams
ADS can hide data in NTFS streams.
Hashing
Why wrong: Hashing verifies data integrity, does not 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)
Alternate Data Streams (ADS) hide data in NTFS streams. Slack space can hide data in unused cluster space. HPA hides data in a reserved area on ATA drives. File carving is a recovery technique, not hiding. Hashing verifies integrity.
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 carving
Why it's wrong here
File carving recovers data, not hides it.
Host Protected Area (HPA)
Why this is correct
HPA is a hidden area on ATA drives.
Related concept
OSPF neighbours must agree on key parameters.
Slack space
Why this is correct
Data can be hidden in file slack or volume slack.
Related concept
OSPF neighbours must agree on key parameters.
Alternate Data Streams
Why this is correct
ADS can hide data in NTFS streams.
Related concept
OSPF neighbours must agree on key parameters.
Hashing
Why it's wrong here
Hashing verifies data integrity, does not hide data.
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) — Alternate Data Streams (ADS) hide data in NTFS streams. Slack space can hide data in unused cluster space. HPA hides data in a reserved area on ATA drives. File carving is a recovery technique, not hiding. Hashing verifies integrity.
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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