In order to read data spindle rotates to move the read /write head on correct track
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The top and bottom of each disk of a magnetic hard drive have a read / write head that moves across the disk surface as all the disks rotate on a spindle. The speed at which the platter rotates is known as spindle speed. Data access is faster if the spindle speed is faster. The spindle rotates faster than the read / write head. The head delays for a short time to move to the correct sector in the correct track where the data is present. This time delay is called latency. It is measured in milliseconds.
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