Which of the following RAID configurations consists of mirrored disks?

RAID 0 stripes data across multiple disks to improve read and write performance but provides no redundancy - the failure of any single disk results in complete data loss.

RAID 1 duplicates all data by writing the exact same blocks to two or more physical disks at the same time, creating a complete mirror copy on each drive. If any one disk fails, a full copy of the data remains on the surviving disk and the system continues to operate without interruption. Because usable capacity equals only the size of a single drive, RAID 1 trades storage efficiency for maximum redundancy.

RAID 5 distributes data and a single parity block across three or more disks, allowing recovery from one disk failure, but uses striping with parity rather than mirroring.

RAID 6 extends RAID 5 by adding a second distributed parity block to tolerate two simultaneous disk failures, but it also relies on striping with parity rather than disk mirroring.