6.2.2+Disk+Access+Time

=__**Description of access time in terms of latency (rotational delay), seek time and transfer time.**__=

Disk access time can be calculated by adding up the 'seek time' and the average 'latency time'
 * Seek time: the time needed for the read/write arm to look for the desired track
 * Latency time (also called rotational delay): the time it takes for the desired sector on the track to spin around to the read/write arm (since the piece of data required might be on the other side of the disk relative to the read/write at the moment).
 * Transfer time: the time a hard disk drive needs to read and transmit one block of data
 * Disk access time in hard disk drives is measured in milliseconds
 * Even though this might seem fast, CPUs are still able to calculate much faster than this, causing hard disk drives to be slow in comparison


 * Disk access time = seek time + latency time + transfer time**

Written by Jocbe Last Update: 24. September 2010

> ed. Hoboken: John wiley & Sons, Inc., 2003. Print.
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