The answer is a hidden partition, specifically one created using the Host Protected Area (HPA) or Device Configuration Overlay (DCO). This is the most likely cause of a USB drive capacity discrepancy because both HPA and DCO allow a portion of the storage to be concealed from the operating system, making the drive appear smaller than its physical size. When an analyst sees an 8 GB drive showing only 7 GB accessible, the missing 1 GB is often hidden via these ATA commands, which are designed for vendor-specific data or forensic countermeasures. On the CHFI exam, this scenario tests your understanding of how anti-forensic techniques manipulate drive geometry; a common trap is to assume the space is simply unallocated or damaged. Remember the mnemonic “HPA hides, DCO disguises” — HPA uses a boundary change, while DCO overrides the reported capacity entirely, but both result in the same forensic symptom of missing space.
CHFI Storage Forensics and File System Analysis Practice Question
This CHFI practice question tests your understanding of storage forensics and file system analysis. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is examining a USB drive that appears to have a smaller capacity than expected. The drive is detected as 8 GB but only 7 GB is accessible. Which of the following is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The drive has a Host Protected Area (HPA) hiding 1 GB
The missing space could be due to an HPA (Host Protected Area) or DCO (Device Configuration Overlay) configured to hide the additional space.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The file system uses a cluster size that wastes space
Why it's wrong here
Cluster waste reduces usable space but not by 1 GB on an 8 GB drive typically.
✗
The drive is formatted with FAT32 which has a 4 GB file size limit
Why it's wrong here
FAT32 limit is 4 GB per file, not volume capacity.
✓
The drive has a Host Protected Area (HPA) hiding 1 GB
Why this is correct
Correct: HPA can hide a portion of the drive from the OS.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Common exam trap: OSPF can fail even when IP connectivity looks correct
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
How to think about this question
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.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
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
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
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.
Storage Forensics and File System Analysis — This question tests Storage Forensics and File System Analysis — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The drive has a Host Protected Area (HPA) hiding 1 GB — The missing space could be due to an HPA (Host Protected Area) or DCO (Device Configuration Overlay) configured to hide the additional space.
What should I do if I get this CHFI question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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