Descriptive of a CD-ROM drive capable of reading and transferring data at a speed which is twice as fast as a single-speed drive. A single-speed CD-ROM drive, in retrospect designated 1X, could process data at a speed of 150 kilobytes per second. A double-speed CD-ROM can thus process data at a speed of 300 kilobytes per second. Later triple-speed drives process data at a speed of 450 kilobytes per second. Newer drives have even faster access times: 600 kilobytes per second (quad speed, or 4X, drives), 900 kilobytes per second (6X drives), 1200 kilobytes per second (8X drives), and 1500 kilobytes per second (10X drives).

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