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Disk

The two most important parameters for a client disk are the maximum seek time and the rotation speed. Maximum seek time is the time it takes for the disk arm to move from the edge to the center of the disk surface. This puts an upper bound on how long it will take you to get any piece of data. A maximum seek time of 12 milliseconds is pretty good. Do not confuse maximum seek time with access time, average seek time, or any of the other terms used by disk manufacturers.

The other important parameter is rotational speed. Typical IDE PC disk rotational speed is 4,500 rpm, but SCSI disks run at 7,200 and 10,000 rpm. Maximum seek time is more important for random access patterns, and rotational speed is more important for sequential reads and writes.


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