| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems such as waste of energy and the production of noise by switching the motor of a disk unit to the optimum rotational speed by adjusting the rotational speed of the motor of a disk unit in a dynamic state to change the rotational speed according to an amount of information transmission required by a computer system, to avoid a shortage of reading ability in the case of the too fast rotational speed, and to suitably accelerate the rotational speed when a reading speed is inferior to the speed required by the computer system. SOLUTION: The disk unit is introduced in a system loop, and the proportionality of the disk information reading time of the disk unit is calculated after time T. Then, the proportionality of time when disk information is read at last m-piece of time T. When the proportionality of time to read the disk information of the disk unit at each time T exceeds a restriction H of acceleration, or when the proportionality of time at each n-piece time T is lower than the restriction L of deceleration of the rotational speed, an operation of acceleration or deceleration is carried out. The above H may be 90% and the above L may be 50%.
|
