RAID 0: N × smallest drive. Fast, no fault tolerance.
RAID 1: mirror. Simple 2-drive mirror = capacity of one drive.
RAID 5: (N − 1) × smallest drive. Minimum 3 drives. Survives 1 drive failure.
RAID 6: (N − 2) × smallest drive. Minimum 4 drives. Dual parity; survives 2 drive failures.
RAID 10: (N ÷ 2) × smallest drive. Minimum 4 drives. Mirrored pairs + striping.
RAID 0 = N × smallest drive
RAID 1 = one drive's capacity in a simple mirror
RAID 5 = (N − 1) × smallest drive
RAID 6 = (N − 2) × smallest drive
RAID 10 = (N ÷ 2) × smallest drive
Rule: mismatched drives use the smallest drive as the calculation size.
Final Score: