RAID RAID (Redundant Array of Independent Disks) offers Performance and Reliability Striped vs Mirrored – Striped has zero redundancy, but Mirrored is redundant. Raid0 – striped. 4 drives in a raid0 at 20gb each provide 80gb total. High performance. You can write to all 4 drives at the same time (called striping). But it comes with a cost. Say that one HD goes down. Then the whole raid array fails because one file could be written across 4 drives, and if one drive goes down, the file is not usable.