What is zettabyte?
A zettabyte (ZB) is a unit of digital information storage that is used to denote the size of data. This corresponds to 1,024 exabytes or 1,000,000,000,000,000,000,000 bytes.
The prefix 'Zetta' is part of the International System of Units (SI) and refers to 1021 units. Hard drive manufacturers label their products in SI, which can confuse some IT people. The ISO, IEEE and IEC all recommend using the unit zebibyte, which specifies 270 bytes and is more precise for the measure of bytes. Two interpretations can be made with the two standards: Using SI, one zettabyte corresponds to 1000 exabytes or 1,000,000,000,000,000,000,000,000 or 1021 bytes. Using a conventional binary measurement, one zettabyte corresponds to 1,180,591,620,717,411,303,424 bytes, which corresponds to 270 bytes, which also corresponds to 1 zebibyte (ZiB).