RAID (Redundant Array of Inexpensive Disks) configurations of the disks are used to provide A. Fault-tolerance B. High speed C. High data density D. (A) and (B)

GATE 1999 · Operating System · Disk · easy

Answer: D. (A) and (B) — RAID provides both fault-tolerance and high speed.

1. Evaluate each option: A. Fault-tolerance: YES — RAID levels 1, 3, 4, 5, 6 all provide fault-tolerance through redundancy (mirroring or parity). B. High speed: YES — RAID levels 0, 3, 4, 5 provide higher throughput through striping. C. High data density: NO — RAID does not increase the density of data storage on the platters; that is a magnetic recording technology concern.
2. Select the correct option: Since both A (fault-tolerance) and B (high speed) are correct, the answer is D: (A) and (B).