Class Notes – AS605_Technology
Summary Outline
Storage capacity: Storage is measured in bytes:
Byte = 1 byte. A single letter is represented as a byte (e.g., letter "a")
Kilobyte = 1,000 bytes. A word-processed document might be dozens to hundreds of kilobytes.
Megabyte = 1,000,000 (1 million) bytes. This represents 1,000 kilobytes. A high-quality digital
music track (MP3) would take up roughly 2 megabytes per minute of music.
Gigabyte = 1,000,000,000 (1 billion) bytes. This represents 1,000 megabytes. A typical movie
DVD can hold 4.7 GB of data, though other versions can hold more. A Blu-ray movie disk can
hold 25 to 50 GB.
Terabyte = 1,000,000,000,000 (1 trillion) bytes. This represents 1,000 gigabytes. As of March
2014, the Library of Congress had collected about 525 terabytes of web-archive data.
Petabyte = 1,000,000,000,000,000 (1 quadrillion) bytes. This represents 1,000 terabytes.
Facebook says it stores some 100 petabytes of media.
Exabyte = 1,000,000,000,000,000,000 (1 quintillion) bytes. This represents 1,000 petabytes.
The National Security Agency has built a data center in Utah with a capacity estimated between
3 and 12 exabytes.
Документ1 // Modified on 8/9/2020
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