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Control design of self-servo track writer (SSTW) has become an important issue in hard disk drive research. This paper discusses the error propagation problem in SSTW control. Although the iterative learning control (ILC) has been suggested as a solution to suppress the error propagation in SSTW, existing suggestions design controllers in the iteration domain requiring considerable computation and...
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...
In the production process of hard disk drive (HDD), there is a process of writing servo signals on magnetic disks to move the head to target address. However, conventional servo track writer takes longer time to draw servo signals because of recent increase of the capacity of HDD. Therefore, they desire a low-cost method to draw servo signals. In order to resolve the problems, self servo track writing...
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 the production process of hard disk drive (HDD), there is a process of writing servo signals on magnetic disks to move the head to target address. However, such a servo track writer takes a longer time to draw servo signals because of the recent increase of the capacity of HDD. Therefore, a low-cost method to draw servo signals is desired. In order to resolve the problems, SSTW method (self servo...
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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