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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. The technical documentation for your disks contains the exact physical disk capacities.

Disk size as described by manufacturer Physical capacity (MiBs, approximate) Usable capacity (MiBs)
100 GB SSD (X441A-R5) 95,396 95,146
100 GB SSD (X442A-R5) 84,796 84,574
200 GB SSD 190,782 190,532
800 GB SSD 763,097 762,847
300 GB SAS/FC 280,104 272,000
450 GB SAS/FC 420,156 418,000
500 GB SATA 423,946 423,111
600 GB SAS/FC 560,208 560,000
900 GB SAS 858,483 857,000
1.2 TB SAS 1,144,641 1,142,352
1 TB SATA 847,884 847,555
2 TB SATA 1,695,702 1,695,466
3 TB SATA 2,543,634 2,538,546
4 TB NL-SAS 3,815,447 3,807,816