Which RAID level stores an exact mirror copy of data on two or more drives, allowing the array to continue operating without permanent data loss if one drive in the set fails?
RAID 1
RAID 10
RAID 5
RAID 0
RAID 1 mirrors (duplicates) all data on each disk in the array. If any one drive fails, the data remains available on the surviving drive(s), so no permanent data loss occurs until additional failures happen. Other listed RAID levels cannot tolerate a single-disk failure without risking data loss (RAID 0) or rely on parity calculations rather than mirroring (RAID 5), or combine striping and mirroring in nested form (RAID 10).
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