Accurate servo track writers (STWs) are indispensable for hard disk drives (HDDs) with high track density. We have developed a prototype hybrid-type STW, which has two writing stages, and compared the servo patterns w...
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Accurate servo track writers (STWs) are indispensable for hard disk drives (HDDs) with high track density. We have developed a prototype hybrid-type STW, which has two writing stages, and compared the servo patterns w...
详细信息
Accurate servo track writers (STWs) are indispensable for hard disk drives (HDDs) with high track density. We have developed a prototype hybrid-type STW, which has two writing stages, and compared the servo patterns with those by the conventional STW. The experimental results are described showing that the hybrid-type STW reduces the maximum value of repeatable runout (RRO) by about 40% and the track misregistration (TMR) in the HDD.
The experimental lifetime predictive equation for a piggyback PZT actuator was obtained. It agrees with Arrhenius' equation. The lifetime of our developed actuator was estimated longer than 5 years under heavy con...
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The experimental lifetime predictive equation for a piggyback PZT actuator was obtained. It agrees with Arrhenius' equation. The lifetime of our developed actuator was estimated longer than 5 years under heavy conditions. This lifetime prediction method is useful to design the piggyback PZT actuator for HDDs.
The experimental lifetime predictive equation for a piggyback PZT actuator was obtained. It agrees with Arrhenius' equation. The lifetime of our developed actuator was estimated longer than 5 years under heavy con...
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The behavior of the air flow inside a hard disk drive is evaluated by a three-dimensional unsteady-flow analysis technique called large eddy simulation (LES). The simulation shows that the fluctuation of the aerodynam...
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The behavior of the air flow inside a hard disk drive is evaluated by a three-dimensional unsteady-flow analysis technique called large eddy simulation (LES). The simulation shows that the fluctuation of the aerodynam...
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The behavior of the air flow inside a hard disk drive is evaluated by a three-dimensional unsteady-flow analysis technique called large eddy simulation (LES). The simulation shows that the fluctuation of the aerodynamic force is strongly correlated with the amplitude of the disk vibration, which causes positioning error of the read/write head. It also shows that the power loss caused by the friction of the air on the disks, which accounts for most of the power consumption of hard disk drives at a high-speed revolution, can be qualitatively predicted.
Layout optimization of junctions yields the minimumnumber of junctions. And a fewer junctions means fewer jointcomponents or fewer spot-welding operations, and this leads tohigher production efficiency. A method is de...
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