The smallest unit of data measurement is a bit. It may hold one of two values it may be 0 or 1, that correspond to the electrical values of off or on.
Since bits are small, these rarely are used because it is information with one bit at the time. These are usually made groups of eight to form a byte. A byte contains sufficient information to store one ASCII character (American Standard Code for Information Interchange: it is a codification pattern.
A kilobyte (KB) isn´t made of one thousand bytes as most of us thought. A kilobyte is actually made of 1,024 because it uses binary math, instead of decimal math (1000).
Computer storage is more often measured in megabytes (MB) and gigabytes (GB). A megabyte contains 1024 kilobytes, a gigabyte contains 1024 megabytes or 1,073,741,824 bytes. With 1,024 gigabytes you make a terabyte (TB) which is 1610 CD´s worth of data. 1024 terabytes make a petabyte (PB) that are 223,100 DVD´s. An Exabyte (EB) is 1,024 petabytes, a zettabyte (ZB) that are 1,024 exabytes, and finally a yottabyte that is 1,024 zettabytes.
For more information visit:
https://techterms.com/help/data_storage_units_of_measurement
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