Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Disk Power Saving

  • Kazuo Goda
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1324

Definition

The term Disk Power Saving refers to the function of reducing the electric power that is consumed in a disk drive. Typically, Disk Power Saving cuts power supply to a particular component of the disk drive or slows down the component. In most cases, the disk drive cannot respond to input/output requests while it is in such a power saving mode.

Key Points

Power modes of modern disk drives are often classified as normal and stand-by. A disk drive in the normal mode is either processing read/write requests or ready to immediately start processing read/write requests. In this mode, all the components are almost fully operating. The disk drive thus consumes higher electric power than in the other modes. In contrast, a disk drive in the other modes cannot start processing read/write requests immediately. In the stand-by mode, the spindle motor is spun down and the head assembly is unloaded to the ramp and powered off; only the controller or a partial circuit of the controller...

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Recommended Reading

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    Gurumurthi S, Sivasubramaniam A, Kandemir M, Franke H. Reducing disk power consumption in servers with DRPM. IEEE Comput. 2003;36(12):59–66.CrossRefGoogle Scholar
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    HGST Inc. Quietly cool. White Paper, HGST; 2004.Google Scholar
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    Yada H, Ishioka H, Yamakoshi T, Onuki Y, Shimano Y, Uchida M, Kanno H, Hayashi N. Head positioning servo and data channel for HDDs with multiple spindle speeds. IEEE Trans Magn. 2000;36(5):2213–5.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.The University of TokyoTokyoJapan

Section editors and affiliations

  • Masaru Kitsuregawa
    • 1
  1. 1.Inst. of Industrial ScienceUniv. of TokyoTokyoJapan