RAID discussions get confusing fast because raw capacity and usable capacity are not the same thing. Before you compare chassis sizes or disk prices, it helps to know what your redundancy choice actually costs.
Usable capacity estimate:
Calculating…
RAID estimates assume equal drive sizes and omit filesystem overhead.
This estimate assumes equal drive sizes and ignores filesystem overhead. It is useful for planning and comparisons, but you should always verify the final layout against the filesystem or NAS platform you actually intend to use.
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