A byte was a unit of computer storage.
In 2364, the Bynars performed a computer core dump from Bynaus in the USS Enterprise-D. This act filled every byte of free space in the starship's computer core. (TNG: "11001001")
Comparative list of storage measurement
- Gigabyte = 1 billion bytes
- Gigabytes. Nanites being studied by Wesley Crusher in the 24th century had "gigabytes of mechanical computer memory". (TNG: "Evolution")
- 300 gigabytes. Commodore Oh accused Dr. Agnes Jurati of transferring 300 gigabytes of data concerning Bruce Maddox to a PADD, and presumably giving it to Jean-Luc Picard. (PIC: "Nepenthe")
- 3,000 gigabytes. Henry Starling noted that when Captain Janeway and Commander Chakotay attempted to download his database, they had downloaded 3,000 gigabytes of data when Starling forced them to terminate their download. (VOY: "Future's End")
- XB
- 19.3 XB. D'Jamat deleted 19.3 XB of data Enterprise NX-01 had collected on the Delphic Expanse spheres. (ENT: "Chosen Realm")
According to TNG: "The Measure Of A Man", Data was built with the ultimate storage capacity of eight hundred quadrillion bits. At eight bits per byte, it can be calculated that Data had one hundred thousand terabytes of memory.