Kilo, Mega, Giga

The smallest piece of data in computers is a bit. A bit is single digit 0 or 1.

Some larger collections of bits have special names too. The following animation demonstrates. Move the green handle to navigate.

The sizes of the cubes reliably represent their true (relative) sizes.

Here are some useful measurements:

  • CD (Compact disc): 700 Megabyte
  • DVD (DVD is actually not an acronym of anything!): 4.7 Gigabyte
  • Memory stick (flash memory): Usually around 16 Gigabyte.
  • Personal computer's internal memory: between a few hundreds of Megabytes to a few Gigabytes.
  • Hard disk: several dozens of Gigabytes. The biggest hard disks may have even a Terabyte or two.

See also