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In this paper, we develop a new trajectory generation for seek control of hard disk drives to minimize energy consumption. A seek time is given by just-in-time method. Just-in-time method can provide some potential for energy efficient seek control by variable seek time. Additionally, regarding constant disturbance, we compare two cases. One is the case with compensating disturbance and another is...
We have developed content protection technologies best suitable for hard disk drives. Besides large capacity and high speed, the hard disk drive has some better features than optical discs, one of which is intelligent enough to make bi-directional authentication to the system. This benefit realizes more flexible and reliable protection of digital content. This paper describes the total framework of...
We previously developed standards for a new type of removable storage device called an "information versatile disk for removable usage" (iVDRtrade1) as members of the iVDR hard disk drive consortium. The standards cover both the physical and application aspects, but not cover content protection. We have now developed architecture to protect the content recorded on the removable storage device...
In this paper, novel multirate two-degree-of-freedom controllers are proposed for digital control systems, where it is restricted that the speed of the A/D converters are slower than that of the D/A converters. The proposed feedforward controller assures the perfect tracking at M inter-sampling points. Moreover, it is shown that the structure of the proposed perfect tracking controller is very simple...
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