220-801 · Question #787
Which of the following RAID types writes data identically to multiple drives at the same time?
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
Options
- ARAID 0
- BRAID 1
- CRAID 5
- DRAID 10
How the community answered
(25 responses)- A4% (1)
- B92% (23)
- D4% (1)
Why each option
RAID 1, known as disk mirroring, writes identical data to two or more drives simultaneously to provide redundancy.
RAID 0 stripes data across drives for performance but provides no redundancy and does not write identical copies.
RAID 1 duplicates every write operation across all member drives in real time, so each drive holds a complete, identical copy of the data. This provides fault tolerance because if one drive fails, the mirror drive contains a full copy of all data with no data loss.
RAID 5 stripes data with distributed parity across three or more drives; it does not write identical copies to all drives.
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
Source: https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-fault-tolerance
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