RAID is a type of disk, where several physical disks are combined into an array for better speed and fault tolerance. RAID 0 implements data striping where file blocks are written to separate drives. RAID 0 does not provide fault tolerance, because failure of one drive will result in data loss. RAID 1 implements data mirroring. Data is duplicated on two drives either through software or hardware. It provides faster read performance than a single drive.