The full form of YiB is Yobi Byte

A yobibyte (YiB) is a unit of measure used to describe data capacity as part of the binary system of measuring computing and storage capacity. The prefix yobi was created along with several others as part of the binary capacity measurement system, which is based on powers of two.

A yobibyte (YiB) is a unit of digital information storage used to denote the size of data. It is equivalent to 2^80, or 1,208,925,819,614,629,174,706,176, bytes and equal to 1,024 zebibytes.

Yobibyte is related to a yottabyte, which is equal to 10²⁴, or 1,000,000,000,000,000,000,000,000, bytes. The “yobi” prefix was not an original part of the binary prefixes system, but was added in August 2005 by the International Electrotechnical Commission.