The incredible feat of a read/write head:  Today's new generation of disc
 drives achieve the engineering equivalent of a Boeing 747 flying at MACH 4
 just two meters above the ground, counting each blade of grass as it flies
 over.  The read/write head floats at 12 millionths of an inch above the
 surface of the disc which is turning at 3,600 revolutions per minute.
 Read/write heads position precisely over information tracks which are 800
 millionths of an inch apart and the data is electronically recorded at
 20,000 bits per inch.



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