|Unit of Digital Information Storage|
|Yottabyte|| 1024 Bytes|
|(larger units were proposed but have not yet formally been adopted by the BIPM)|
A Yottabyte (YB), derived from yotta- prefix, is an International System of Units (SI) unit of digital information storage equal to 1000 zettabyte. This unit is part of IEC 80000-13 (International System of Quantities) which requires this unit to always equal 1000 zettabytes. A closely related unit, yobibyte, is used to represent 1024 zebibytes.