The biggest type of byte I can possibly think of. One yottabyte can hold 1024^8 == 1,208,925,819,614,629,174,706,176 bytes of data! That's approximately 57,646,075,230,342,349 20-gig hard drives, people!
To refer to powers of 2^10 (powers of 1024), use the new binary prefixes kibi, mebi, gibi, tebi, pebi, and exbi. That is as high as they go; there are no official prefixes "zebi" or "yobi".
These new prefixes were created in December 1998 by the International Electrotechnical Commission: see the node prefixes for binary multiples for fuller explanation.
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