A bit (an acronym standing for Binary digIT) was a unit of information stored in a computer. It was commonly represented as a zero (0) or one (1).
A scan of the Ilia unit created by V'ger was made at "Opticomm: 10,000 megabits." (Star Trek: The Motion Picture)
The Soong-type android Data was built with the ultimate storage capacity of eight hundred quadrillion (800 ×1015) bits. (TNG: "The Measure Of A Man")
At eight bits per byte, it can be calculated that Data has one hundred petabytes of memory.