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FC0-U71 Practice Question: Protect against data loss if a single hard drive…
A company wants to protect against data loss if a single hard drive fails. They have three identical drives. Which RAID configuration provides fault tolerance while maximizing storage capacity?
⚠ Common exam trap
It's easy for candidates to confuse RAID 5 with RAID 0 or RAID 1, mistakenly thinking striping alone (RAID 0) provides redundancy or that mirroring (RAID 1) maximizes capacity, when in fact RAID 5 is the only option among these that balances fault tolerance and storage efficiency with three drives.
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
✓
RAID 5
RAID 5 uses block-level striping with distributed parity, so if one of the three drives fails, the data can be rebuilt from the remaining drives plus the parity information. With three drives, RAID 5 provides fault tolerance for a single drive failure while using only one drive's worth of capacity for parity, maximizing usable storage (2/3 of total raw capacity).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RAID 0
Why it's wrong here
RAID 0 provides no redundancy; any drive failure loses data.
- ✗
JBOD
Why it's wrong here
JBOD is a span of drives without redundancy.
- ✗
RAID 1
Why it's wrong here
RAID 1 mirrors data, but with three drives it only gives capacity of one drive.
- ✓
RAID 5
Why this is correct
RAID 5 stripes data with parity, allowing one drive to fail without data loss.
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: Jun 25, 2026
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