Use this RAID and NAS capacity calculator to estimate raw storage, usable capacity, redundancy overhead, and drive-failure tolerance before choosing a NAS and hard drives.
Raw capacity48 TB
Estimated usable36 TB
Redundancy overhead12 TB
Minimum NAS size4-bay
RAID 5
RAID 5 uses the equivalent capacity of one drive for distributed parity. It provides one-drive fault tolerance while preserving more usable capacity than mirroring.
Drive-failure tolerance
1 drive
Explore matching storage options
Matching NAS devices
Matching NAS hard drives
Capacity is shown in manufacturer-style decimal TB for simplicity. Actual formatted capacity displayed by an operating system can be lower. RAID does not replace a separate backup. Product recommendations are based on bay count and drive capacity, not an exact manufacturer compatibility guarantee.