Which RAID level requires the least number of drives for implementation?

RAID Level 0 requires a minimum of two drives for implementation, as it uses striping to distribute data across multiple disks for improved performance without redundancy. However, when considering RAID Level 1, it only requires two drives as well, but its purpose is mirroring data for redundancy. It results in the same amount of storage space as a single drive, since the data is duplicated.

In contrast, RAID Level 5 requires at least three disks. It employs a combination of striping and parity to provide both performance and fault tolerance. Similarly, RAID Level 10, which is a combination of RAID 1 and RAID 0, requires at least four drives since it mirrors and stripes data across paired drives.

Given that RAID Level 1 requires only two drives and offers redundancy through mirroring, it is correct to assert that it requires the least number of drives for effective implementation among these RAID levels. This distinction highlights the balance between redundancy and the number of drives required for different RAID configurations.