Discussion
Which Redundant Array of Independent Disks (RAID) technology maintains copy of an entire hard disk on other hard disk ?
Answer: B
The copy of an entire disk is kept by RAID 1.
RAID 1 is mirroring: every write goes to two (or more) disks, so each holds a complete copy of the other, and either can serve the data if one fails.
RAID 0 stripes data across disks with no redundancy. RAID 5 stripes data with distributed parity rather than a full copy. RAID 10 combines mirroring with striping, but the level whose defining feature is a whole-disk copy is RAID 1.
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