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Usable and physical disk capacity by disk size
You cannot use the nominal size of a disk in your aggregate and storage system capacity calculations. You must use either the usable capacity or the physical capacity as calculated by Data ONTAP.
The following table lists the approximate physical and usable capacities for the disk sizes currently supported by Data ONTAP. The numbers shown are in Mebibytes (MiBs). This unit of measure is equivalent to 2 to the 20th power bytes. (MBs, in contrast, are 10 to the sixth power bytes.)
The physical capacities listed in the table are approximations; actual physical disk capacities vary by disk manufacturer. See the technical documentation for your disks for the exact physical disk capacities.
Disk size as described by manufacturer
Physical capacity (approximate)
Usable capacity
100 GB SSD (X441A-R5)
95,396 MiB
95,146 MiB
100 GB SSD(X442A-R5)
84,796 MiB
84,574 MiB
200 GB SSD
190,782 MiB
190,532 MiB
300 GB SAS/FC
280,104 MiB
272,000 MiB
450 GB SAS/FC
420,156 MiB
418,000 MiB
500 GB SATA
423,946 MiB
423,111 MiB
600 GB SAS/FC
560,208 MiB
560,000 MiB
900 GB SAS
858,483 MiB
857,000 MiB
1 TB SATA
847,884 MiB
847,555 MiB
2 TB SATA
1,695,702 MiB
1,695,466 MiB
3 TB SATA
2,543,634 MiB
2,538,546 MiB
4 TB NL-SAS
3,815,447 MiB
3,807,816 MiB

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