CompTIA Tech+ (FC0-U71)InfrastructureHard
A small business owner wants a storage configuration for a file server that mirrors data across two identical drives so that if one drive fails, the data remains fully accessible from the other with no data loss. Which RAID level should be implemented?
- ARAID 1
- BRAID 5
- CRAID 0
- DRAID 10
Show answer & explanationAnswer & explanation
Correct answer: A. RAID 1
RAID 1 mirrors data identically across two drives, providing full redundancy so that if one drive fails, the other retains a complete copy with no data loss, though total usable capacity equals only one drive. RAID 0 stripes data for performance with no redundancy, RAID 5 uses striping with parity across three or more drives, and RAID 10 combines mirroring and striping but requires at least four drives.
Why the other options are wrong
- B. RAID 5 requires at least three drives and uses parity, not simple two-drive mirroring.
- C. RAID 0 stripes data for speed but offers no redundancy; a single drive failure loses all data.
- D. RAID 10 requires at least four drives combining mirroring and striping.
RAID 1 (Mirroring)
A RAID level that duplicates data identically across two drives for redundancy, so data survives a single drive failure.
- Requires exactly two drives (or pairs)
- Usable capacity equals one drive's size
- No performance boost for writes, but redundant
Memory trick: RAID 1 = a mirror image, one drive reflecting the other exactly.