The rotational delay and transfer time are partially determined by rotational speed, expressed in revolutions per minute (RPM). Typically, manufacturers report seek times of 8 to 10 ms.
Hard drives are often restricted to a transfer rate of between 100 MBps and 200 MBps because of how they operate—with rotating discs—and how they store and access data. Data is transferred from the disk over a period of time, or "transfer time." The speed of the disk's spinning affects it. The number of bytes on a single track is also referred to as the disk density, and the more quickly a disk rotates, the faster we can read data from it. Lower transfer times result from faster data transfer.
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