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15K rpm, 10K rpm, and desktop (5400 rpm) all use the same size disk: 3.5" in diameter. The disk size changes when you go to mobile devices (for example, laptops) then it is 2.5" in diameter. GPS and iPods use a 1.8" diameter disk, and for a while, there was a 1" diameter disk for the IBM Microdrive for digital applications. --Hollisterbulldawg (talk) 20:07, 12 September 2008 (UTC)