FC0-U71 Tech Concepts and Terminology Practice Question
A help desk technician is comparing storage capacity specifications for two laptops. One specification lists the SSD as 512 GB and the other lists it as 512 GiB. The technician needs to explain to a customer why the operating system reports a lower usable capacity than the advertised number. Which of the following best explains this difference?
⚠ Common exam trap
The trap here is assuming the missing space is hidden by formatting or reserved partitions rather than recognizing the decimal-versus-binary unit conversion.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
GB uses powers of 1000 while GiB uses powers of 1024, so the same physical capacity is reported as a smaller number when measured in GiB
The apparent capacity loss occurs because manufacturers advertise decimal gigabytes based on powers of 1000, while many operating systems report binary gibibytes based on powers of 1024. Since a gibibyte is about 7.4 percent larger than a gigabyte, the same physical drive shows a smaller number in GiB. Recognizing this unit distinction lets the technician explain the discrepancy accurately.
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 operating system reserves part of the drive for the file system, so the missing capacity is always exactly the formatting overhead
Why it's wrong here
This is incorrect because file system metadata and formatting overhead consume only a small, variable amount of space, not the consistent roughly seven percent gap seen between GB and GiB figures. The difference in the scenario is caused by the unit definition itself, not by partitioning or file system structures, so this explanation misidentifies the root cause.
- ✗
GiB measures only the cache portion of the drive while GB measures the full platter area available to the user
Why it's wrong here
This is incorrect because GiB and GB are both units of digital storage capacity describing the same addressable space, not separate physical regions of a drive. Cache memory is a distinct concept measured in megabytes and is not what the GiB label represents. The unit mismatch, not a division of drive areas, causes the reported capacity gap.
- ✗
GB is used for solid-state drives and GiB is used for magnetic hard drives, so the two laptops are using different storage technologies
Why it's wrong here
This is incorrect because the GB and GiB labels describe measurement conventions, not storage media types. Both solid-state and magnetic drives can be labeled with either unit, and the scenario already states both machines use SSDs. The discrepancy stems from decimal versus binary prefixes, not from a difference in drive technology.
- ✓
GB uses powers of 1000 while GiB uses powers of 1024, so the same physical capacity is reported as a smaller number when measured in GiB
Why this is correct
This is correct because decimal GB is based on powers of 1000 (1 GB = 1,000,000,000 bytes), whereas binary GiB is based on powers of 1024 (1 GiB = 1,073,741,824 bytes). A drive marketed as 512 GB holds about 512,000,000,000 bytes, which the OS expresses as roughly 476 GiB, explaining the apparent shortfall the customer notices.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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