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# Capacity information

Unisphere for PowerMax supports measurement of capacity using both the base 2 (binary) and base 10 (decimal) systems.

Storage capacity can be measured using two different systems – base 2 (binary) and base 10 (decimal). Organizations such as the International System of Units (SI) recommend using the base 10 measurement to describe storage capacity. In base 10 notation, one MB is equal to 1 million bytes, and one GB is equal to 1 billion bytes.

Operating systems generally measure storage capacity using the base 2 measurement system. Unisphere for PowerMax and Solutions Enabler use the base 2 measurement system to display storage capacity with the TB notation as it is more universally understood. In base 2 notation, one MB is equal to 1,048,576 bytes and one GB is equal to 1,073,741,824 bytes.

Table 1. Capacity information
Name | Abbreviation | Binary Power | Binary Value (in Decimal) | Decimal Power | Decimal (Equivalent)
--- | --- | --- | --- | --- | ---
kilobyte | KB | 210 | 1,024 | 103 | 1,000
megabyte | MB | 220 | 1,048,576 | 106 | 1,000,000
GB | GB | 230 | 1,073,741,824 | 109 | 1,000,000,000
terabyte | TB | 240 | 1,099,511,627,776 | 1012 | 1,000,000,000,000