CompTIA
220-801 · Question #787
220-801 Question #787: Real Exam Question with Answer & Explanation
The correct answer is B: RAID 1. RAID 1, known as disk mirroring, writes identical data to two or more drives simultaneously to provide redundancy.
Question
Which of the following RAID types writes data identically to multiple drives at the same time?
Options
- ARAID 0
- BRAID 1
- CRAID 5
- DRAID 10
Explanation
RAID 1, known as disk mirroring, writes identical data to two or more drives simultaneously to provide redundancy.
Common mistakes.
- A. RAID 0 stripes data across drives for performance but provides no redundancy and does not write identical copies.
- C. RAID 5 stripes data with distributed parity across three or more drives; it does not write identical copies to all drives.
- D. RAID 10 combines mirroring and striping, but the mirroring component is RAID 1; RAID 10 itself is a nested level, not the base type that purely writes data identically.
Concept tested. RAID 1 disk mirroring redundancy
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