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Study on flow-induced vibration of head–disk assembly mechanisms in actual hard disk drive

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Abstract

Achieving ultra-high magnetic-recording density in hard disk drives (HDDs) requires clarification of flow-induced vibration issues. In particular, it is necessary to reduce the flow-induced disk vibration called disk flutter. Thus far, however, there has been no experimental research related to disk flutter in actual HDDs. For this study, therefore, the disk-flutter issues have been studied experimentally, using an actual 2.5-in. HDD with one disk and two magnetic heads. The aim was to study the effect of operating magnetic-head mechanisms on flow-induced disk flutter. This study evaluated disk flutter as well as static pressure distribution in the actual HDD, by taking measurements while changing the operating modes of the magnetic-head mechanism as well as the number of operating air-bearing sliders. The study demonstrated that the disk-flutter amplitude increases and its frequency decreases when the magnetic-head mechanisms are operating. It was also found that the amount of decrease in the disk-flutter frequency depends on the number of operating air-bearing sliders whose amplitude increase varies with the specific operating mode of the head mechanisms, such as whether it is in track-following or seek modes. In addition, operation of the magnetic-head mechanisms generated non-uniform static pressure distribution within the HDD. These factors suggest that a decrease in disk-flutter frequency results from the slider-coupled vibration and an increase in disk-flutter amplitude results from the static pressure changes as well as air-following changes, as these vary with the actual operation of the disk head mechanism. From these experimental results, it appears that the disk-flutter issues in actual HDDs should be considered as a system that includes the operation of the magnetic-head mechanisms and disk-coupled vibration.

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Acknowledgments

The present work was supported in part by the Kansai University High-Tech Research Center’s Project: the development of the innovative nanotechnology for the Tbit class ultra high density information storage systems supporting the ubiquitous society, 2005–2009.

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Authors and Affiliations

  1. Graduate School of Engineering, Kansai University, 887-2 Yoshino, Maizuru-shi, Kyoto, 625-0003, Japan

    Shigenori Takada

  2. Kyocera Mita Co. Ltd., 1-2-28 Tamatsukuri, Chuoh-ku, Osaka, 540-8585, Japan

    Takashi Kusukawa

  3. High Technology Research Center (HRC), Department of Mechanical Engineering, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka, 564-8680, Japan

    Norio Tagawa & Atsunobu Mori

  4. Panasonic Shikoku Electronics Co. Ltd., 2131-1, Minamigata, Toon, Ehime, 791-0395, Japan

    Yoshiaki Mizoh & Masaru Nakakita

Authors
  1. Shigenori Takada
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  2. Takashi Kusukawa
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  3. Norio Tagawa
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  4. Atsunobu Mori
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  5. Yoshiaki Mizoh
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  6. Masaru Nakakita
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Correspondence to Shigenori Takada.

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Takada, S., Kusukawa, T., Tagawa, N. et al. Study on flow-induced vibration of head–disk assembly mechanisms in actual hard disk drive. Microsyst Technol 13, 767–775 (2007). https://doi.org/10.1007/s00542-006-0279-8

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  • DOI: https://doi.org/10.1007/s00542-006-0279-8

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