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A portable hard drive such as a Zip drive or Magneto Optical that uses removable cartridges to hold data. Zip disks are either 100 or 250Mb while magneto optical are 230Mb, 640Mb or 1.3Gb. The disks can be reused and are ideal for backing up and transporting large digital images.
This is how much data (usually indicated in megabytes [MB]) that can be stored on either a hard drive or a drive's removable media disks.