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5x 16TB RAID 6 NAS Calculator | Usable TB

Estimate usable TB, parity overhead, and fault tolerance for 5x 16TB in RAID 6. Includes reserve planning for NAS and homelab arrays.

Capacity Snapshot

Raw Capacity

80.00 TB

Usable Capacity

43.20 TB

Fault Tolerance

2 drives

Efficiency

60.0%

Safer for larger arrays with dual parity, at the cost of one extra parity disk. This scenario applies a 10% filesystem reserve.

Run Interactive Calculator →

Alternative Mode Comparison

Mode Usable Tolerance Efficiency
RAID 5 57.60 TB 1 drive 80.0%
RAID 6 43.20 TB 2 drives 60.0%
RAID 10 N/A N/A N/A
RAID-Z1 57.60 TB 1 drive 80.0%
RAID-Z2 43.20 TB 2 drives 60.0%

NAS Cluster Guides

NAS Hub RAID Level Compare RAID Capacity Matrix Planning Quick Sheet RAID Selector NAS FAQ

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Sequential Long-Tail Navigation

← Previous: 5x 16TB RAID 5 NAS Calculator | Usable TB Next: 5x 16TB RAID-Z1 NAS Calculator | Usable TB →

FAQ

How much real-world usable storage does 5x 16TB RAID 6 provide?

This NAS planning scenario estimates 43.20 TB usable after a 10% reserve from 80.00 TB raw.

How many disk failures can RAID 6 tolerate in this setup?

This setup can tolerate 2 drives. Real-world survivability depends on mirror placement, rebuild stress, and drive health.

Should I optimize this 5-drive plan for storage headroom or resiliency first?

For long-lived NAS pools, resiliency first is usually safer. Capacity can be expanded later, while a risky parity choice can force migration sooner.

Can this calculator replace real-world benchmark and rebuild testing?

No. Use this page for pre-purchase sizing, then validate with workload benchmarks, SMART health policy, and a tested restore plan.