Question 43 of 144
SK0-005 troubleshooting Practice Question
After a power outage, a server fails to boot and displays a "Missing operating system" error. The server uses RAID 1 for the OS disk. The administrator verifies both drives are present in the RAID configuration utility but one drive is marked as failed. What should the administrator do FIRST?
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
✓
Check the boot order in BIOS/UEFI
Option C is correct because the system may be trying to boot from an incorrect device, especially after a power event may have reset BIOS settings. Option A is a later step if the array is truly broken. Option B is not the first step because the array itself may be bootable. Option D is unlikely to restore a failed drive.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Boot from a Windows recovery media and run chkdsk
Why it's wrong here
chkdsk repairs filesystem errors but does not address a missing operating system caused by wrong boot device selection.
- ✓
Check the boot order in BIOS/UEFI
Why this is correct
Power loss can reset BIOS settings; verifying the boot order ensures the system looks for the OS on the correct drive.
- ✗
Reseat the failed drive and attempt to boot
Why it's wrong here
Reseating may fix a loose connection but the drive is already marked failed; this is less likely to restore bootability.
- ✗
Replace the failed drive and rebuild the array
Why it's wrong here
While eventually necessary, a RAID 1 with a single failed drive should still boot; the error suggests a boot order issue first.
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
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