Which RAID level provides the weakest data redundancy?

RAID 0 provides the weakest data redundancy because it utilizes a striping method where data is divided and written across multiple disks without any form of redundancy. In a RAID 0 setup, if one disk fails, all data stored across the disks is lost. This configuration is primarily focused on improving performance and maximizing storage capacity rather than protecting data. In contrast, RAID levels such as RAID 1, RAID 5, and RAID 6 incorporate redundancy mechanisms—like mirroring or parity—to ensure that data can be recovered in the event of a disk failure. RAID 1 duplicates data across multiple disks, while RAID 5 and RAID 6 use parity to offer tolerance against disk failures, thereby providing a much higher level of data protection.