CompTIA: Advanced Security Practitioner (CASP) Exam Prep

Answer: A - RAID 1 provides disk mirroring. It mirrors the contents of the disks, making a form of 1:1 ratio real-time backup.

Key Takeaway: With RAID 1, the contents of each disk in the array are identical to that of every other disk in the array. A RAID 1 array requires a minimum of two drives. Disk mirroring provides 100 percent redundancy because everything is stored on two disks. If one disk fails, another disk continues to operate. The failed disk can be replaced and the RAID 1 array can be regenerated.