CSC231 Hard-Disk Arduino Project: some numbers

--D. Thiebaut 16:24, 1 December 2008 (UTC)

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Some data for rotation of 3.5" hard disk with a 1/4" slit in it.

5400.000	rotations per minute (rpm)
90.000	rotations per second (rps)
0.011	sec per rotation
11.111	ms per rotation
	
3.500	inches diameter for disk
10.996	inches in circumference
0.125	inches slot in disk
0.011	portion of rotation when slit is above detector
0.126	ms when slit is above detector