How to Calculate Storage RAID
What is Storage RAID?
RAID calculator determines data protection level, usable capacity, and redundancy. Different RAID levels offer various tradeoffs between speed, capacity, and fault tolerance.
Formula
RAID 0: Capacity = n×D; RAID 1: Capacity = D; RAID 5: Capacity = (n-1)×D; etc.
Step-by-Step Guide
- 1Enter number of drives and drive capacity
- 2Select RAID level
- 3Calculate usable capacity and fault tolerance
Worked Examples
Input
4 drives × 2TB each, RAID 5
Result
Usable: 6TB, Can lose 1 drive
RAID 5 parity stripe
Common Mistakes to Avoid
- ✕Confusing hot spare with usable drives
- ✕Not accounting for RAID rebuild time vulnerability
Ready to calculate? Try the free Storage RAID Calculator
Try it yourself →