Question 58 of 144
SK0-005 server-hardware-installation-management Practice Question
A server with a RAID 5 array of four disks reports a degraded logical drive. The technician replaces the failed disk and rebuilds the array. After the rebuild completes, the array is still degraded. Which of the following 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 replacement disk has a different rotational speed than the other disks
Option B is correct because if the replacement disk is of a different speed (e.g., 10k vs 15k), the RAID controller may not accept it or the rebuild may fail, leaving the array degraded. Option A is wrong because missing a partition would not cause the array to remain degraded after rebuild; the array is at a lower level. Option C is wrong because if the firmware were outdated, the controller would likely not recognize the drive at all. Option D is wrong because the disk name in Windows would not affect the RAID status.
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 replacement disk is assigned a different drive letter in the OS
Why it's wrong here
Drive letter assignment is an OS-level configuration and does not affect the RAID array status at the controller level.
- ✗
The RAID controller firmware is outdated
Why it's wrong here
Outdated firmware would likely cause more general issues, not specifically a single replacement disk failure after rebuild.
- ✓
The replacement disk has a different rotational speed than the other disks
Why this is correct
Many RAID controllers require all drives in an array to have matching specifications; a speed mismatch can cause the rebuild to fail or the drive to be rejected.
- ✗
The replacement disk is missing a partition table
Why it's wrong here
RAID arrays operate at the disk level, not partition level. A missing partition table would not cause the array to stay degraded.
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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Last reviewed: Jul 26, 2026
This SK0-005 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 SK0-005 exam.
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