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220-1201 Practice Question: A technician is deploying a new server that…
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?
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 RAID driver is missing from the OS installation media.
After configuring the RAID array in the UEFI RAID utility, the most likely reason the volume is not visible in the OS installer is that the RAID driver is missing. Operating system installers often do not include third-party RAID drivers, and loading the driver is required for the installer to recognize the logical volume.
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 RAID array was not properly initialized in the UEFI RAID utility, the configuration process itself would likely have failed, or the array would not present itself as a usable logical volume at all. Since the technician successfully configured the array, it implies that the necessary initialization steps were completed within the UEFI. The issue described, where the OS installer cannot find the volume, points to a problem with the operating system's ability to communicate with the *already configured* array, rather than the array's internal readiness.
- ✗
The SATA mode is set to AHCI instead of RAID in the UEFI.
Why it's wrong here
If the SATA mode were set to AHCI, the RAID utility would likely not be available to configure the array. Since the technician successfully configured the array, the SATA mode must have been set to RAID.
- ✗
The UEFI boot mode is set to Legacy, which does not support RAID.
Why it's wrong here
Setting the UEFI boot mode to Legacy primarily affects how the operating system is launched from a storage device, specifically whether it uses the older BIOS-style boot process or the newer UEFI method. This setting does not disable or interfere with the functionality of the RAID controller itself, nor does it prevent the OS installer from recognizing a RAID volume. The RAID array is configured and managed by the controller firmware, independent of the system's boot mode, and would still be visible to an OS installer equipped with the correct drivers.
- ✓
The RAID driver is missing from the OS installation media.
Why this is correct
The RAID driver is absolutely essential for the operating system installer to recognize and interact with the RAID controller and the logical volume it presents. Without the specific driver for the server's RAID controller, the generic OS installation media lacks the necessary instructions to communicate with the hardware. Consequently, the installer will not detect any available storage devices, preventing the installation of the operating system onto the configured RAID array.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA 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 220-1201 exam.