RAID?
Redundant Array of Inexpensive Disks
RAID 0 (Striping)?
1st level of RAID that requires at least 2 drives
RAID 1 ( Mirroring)?
Level 2 of RAID, need at least 2 drives
RAID 5 (Striping with parody)?
Strongest of RAID, cannot lose more than 1 drive or you’ll lose all data however you need at least 3 drives to operate
RAID 6?
Needs a minimum of 4 drives to operate, more popular than RAID 5 and can lose up to 2 drives before losing data