(ISC)2 Certified in Cybersecurity Practice Exam

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What is the minimum number of disks required for RAID level 5?

The correct answer is: 3

RAID level 5 requires a minimum of three disks to function properly. This is because it utilizes a technique called striping with parity. In this configuration, data is split into blocks that are spread across multiple disks, and parity information is calculated to ensure data integrity and redundancy. With at least three disks, RAID 5 can calculate and store the parity information that allows for data recovery in the event that one of the disks fails. If there are only two disks, it wouldn’t be possible to store enough data and parity to achieve the redundancy that RAID 5 is known for. Therefore, three disks are the minimum required to strike a balance between data storage, redundancy, and performance in this RAID configuration.