Usable Capacity Formula

U = S × (n - p)

U = Usable, S = Drive Size, n = Number of Drives, p = Parity Overhead.

Results are estimates. Verify against vendor specs before deployment. Full disclaimer

RAID Capacity Calculator

Map raw vs. usable storage while calculating fault tolerance overhead.

Number of Drives

Drive Size (TB)

RAID Configuration

Usable Capacity
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Fault Tolerance

Write Penalty