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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0100:  Hard Drives
      9  VIII  Physical Characteristics

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Cylinders

Recall the discussion that the read/write heads were stacked into a monolithic block on the actuator arm? That means when one head needs to get some data on a track numbered bigger than zero, the rest of the heads have to go along for the ride. For this reason, tracks are not referred to as tracks but as cylinders.

A way to think of cylinders would be to log a tree. If you had a one-foot section of tree, and cut it into slices each two inches thick, you would have six slices, and each growth ring, on each side of each piece would be a track. A vertical view would be the cylinders.

Figure 55: The same track in multiple platters makes a cylinder.

 


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