The pebibyte is closely related to the petabyte, which can either be a synonym for pebibyte, or refer to 1015 bytes = 1 000 000 000 000 000 bytes, depending on context.
Because of irregularities in using the binary prefix in the definition and usage of the kilobyte, the exact number in common practice could be either one of the following:
This capacity may be expressed unambiguously as a pebibyte.
In October 2004, Lawrence Livermore National Laboratory (LLNL) installed over 1.1 Petabytes of DataDirect Networks high performance storage on BlueGene/L. The San Diego Supercomputer Center (SDSC) in the USA has a 1 petabyte hard disk store and a 6 petabyte robotic tape store, both attached to the National Science Foundation's TeraGrid network.