- A
The RAID array was not properly initialized in the UEFI RAID utility.
Why wrong: If the array were not initialized, it would not appear in the RAID utility; the technician confirmed it was configured there.
- B
The SATA mode is set to AHCI instead of RAID in the UEFI.
For the onboard RAID controller to function, the SATA mode must be set to RAID in the UEFI; AHCI mode treats drives individually, not as an array.
- C
The UEFI boot mode is set to Legacy, which does not support RAID.
Why wrong: Legacy BIOS can support RAID as long as the SATA mode is set to RAID; UEFI mode is not a requirement for RAID functionality.
- D
The RAID driver is missing from the OS installation media.
Even if the array is properly configured, the OS installer needs the RAID driver to see the volume; loading the driver during installation is required.
Quick Answer
The answer is that the RAID driver is missing from the OS installation media. This is the most likely cause because a hardware RAID controller presents the logical array to the operating system as a single virtual disk, but the OS installer lacks the built-in driver to recognize that controller. Without the proper driver loaded, the installer sees only the individual physical drives, not the RAID 10 volume you configured in the UEFI utility. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of storage controller drivers and the OS installation process—a common trap is assuming the array is misconfigured when the real issue is a missing driver. Remember that for any hardware RAID, you must load the driver during installation, often by pressing F6 or browsing for the driver file. Memory tip: “RAID needs a ride—load the driver before the OS can see the array.”
220-1201 BIOS / UEFI Practice Question
This 220-1201 practice question tests your understanding of bios / uefi. 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.
A technician is deploying a new server that requires RAID 10 for data redundancy and performance. The motherboard has an onboard RAID controller. After configuring the RAID array in the UEFI RAID utility, the technician installs the OS, but the RAID volume is not visible in the OS installer. What 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 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
The SATA mode is set to AHCI instead of RAID in the UEFI.
When using a hardware RAID controller, the OS installer needs the appropriate driver to recognize the RAID volume. Without the driver, the installer sees individual drives instead of the array. The technician must load the RAID driver during installation, typically by pressing a key (e.g., F6) or browsing for the driver.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 RAID array was not properly initialized in the UEFI RAID utility.
Why it's wrong here
If the array were not initialized, it would not appear in the RAID utility; the technician confirmed it was configured there.
- ✓
The SATA mode is set to AHCI instead of RAID in the UEFI.
Why this is correct
For the onboard RAID controller to function, the SATA mode must be set to RAID in the UEFI; AHCI mode treats drives individually, not as an array.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The UEFI boot mode is set to Legacy, which does not support RAID.
Why it's wrong here
Legacy BIOS can support RAID as long as the SATA mode is set to RAID; UEFI mode is not a requirement for RAID functionality.
- ✓
The RAID driver is missing from the OS installation media.
Why this is correct
Even if the array is properly configured, the OS installer needs the RAID driver to see the volume; loading the driver during installation is required.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
BIOS / UEFI — This question tests BIOS / UEFI — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The SATA mode is set to AHCI instead of RAID in the UEFI. — When using a hardware RAID controller, the OS installer needs the appropriate driver to recognize the RAID volume. Without the driver, the installer sees individual drives instead of the array. The technician must load the RAID driver during installation, typically by pressing a key (e.g., F6) or browsing for the driver.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 18, 2026
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