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Gigabyte

A gigabyte is a unit of computer storage measurement that is approximately 1,000 megabytes. Gigabytes are the most common unit of measure on "large capacity" storage devices, like hard drives, memory cards, DVDs, Blu-ray discs and are also the measurement most common with modern RAM chips. While the most common definition is 1,000 megabytes, actual storage on formatted devices tends to be frequently a lower number than advertised, because while the box measurement is based on the calculation of 250,000,000,000 bytes, computers measure the storage based on measuring 1,024 bytes as a kilobyte, and 1,024KB as a megabyte. By the comptuer's method of counting, an advertised 250GB hard drive is measured at about 232.5 gigabytes by a computer.

All digital information is expressed as a series of 1s and 0s known as bits. Eight bits combine to make a byte, and the more available bytes a storage medium holds, the more information and storage capacity the device has whether it be a hard drive, RAM, memory cache or other method of digital storage.

  • 1 Bit = either a 1 or a 0 (which makes up binary code)
  • 1 Byte (b) = 8 bits
  • 1 Kilobyte (KB) = roughly 1 thousand bytes.
  • 1 Megabyte (MB) = roughly 1 million bytes.
  • 1 Gigabyte (GB) = roughly 1 billion bytes.
  • 1 Terabyte (TB) = roughly 1 trillion bytes.

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