Which statement differentiates RAID 1 and RAID 0?

Which statement differentiates RAID 1 and RAID 0?

• A. RAID 1 provides redundancy; RAID 0 provides redundancy as well
• B. RAID 1 provides redundancy; RAID 0 distributes data across disks for performance with no redundancy
• C. RAID 1 distributes data; RAID 0 mirrors data
• D. RAID 1 and RAID 0 both require three disks

Answer: (B)

The main idea here is the difference between mirroring and striping in RAID. RAID 1 uses mirroring: every write is duplicated to another disk so you have redundancy. If one disk fails, the other contains the complete data, which is why RAID 1 is favored for fault tolerance. RAID 0 uses striping: data is split across disks to boost performance by allowing parallel reads and writes. There isn’t a full copy stored anywhere, so there’s no redundancy—if a single disk fails, the whole array’s data is typically lost. That makes the statement describing the two as “RAID 1 provides redundancy; RAID 0 distributes data across disks for performance with no redundancy” the best answer. It cleanly captures the essential contrast. Other options misstate the relationship or the setup. One would claim both provide redundancy, which isn’t true for RAID 0. Another reverses the roles of mirroring and striping. The last suggests a fixed disk count of three, but both levels can work with two disks or more.

The main idea here is the difference between mirroring and striping in RAID. RAID 1 uses mirroring: every write is duplicated to another disk so you have redundancy. If one disk fails, the other contains the complete data, which is why RAID 1 is favored for fault tolerance. RAID 0 uses striping: data is split across disks to boost performance by allowing parallel reads and writes. There isn’t a full copy stored anywhere, so there’s no redundancy—if a single disk fails, the whole array’s data is typically lost.

That makes the statement describing the two as “RAID 1 provides redundancy; RAID 0 distributes data across disks for performance with no redundancy” the best answer. It cleanly captures the essential contrast.

Other options misstate the relationship or the setup. One would claim both provide redundancy, which isn’t true for RAID 0. Another reverses the roles of mirroring and striping. The last suggests a fixed disk count of three, but both levels can work with two disks or more.