Usable capacity for RAID 0, 1, 5, or 6 with equal-size disks.
| Usable | – |
Use this calculator to sketch usable space in a simple RAID set. Enter how many disks, the size of one disk, and the level. Size and usable output share the same unit (for example TB).
RAID 0 = n × size. RAID 1 = size (one copy in this model). RAID 5 = (n − 1) × size, at least 3 disks. RAID 6 = (n − 2) × size, at least 4 disks. Four 4 TB disks: RAID 0 = 16, RAID 1 = 4, RAID 5 = 12, RAID 6 = 8.
Hot spares, vendor TiB vs TB, and rebuild risk are ignored. RAID 1 here is a single mirror copy, not n/2 pairs.
Disks: How many disks.
Size each: Size of one disk, same unit as the output.
Level: Array layout.
Usable: Usable capacity in the same unit as disk size.
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