Disk drive energy optimization for audio-video applications

Ravishankar Rao, Sarma Vrudhula, Musaravakkam S. Krishnan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Earlier techniques for low power speed control in disk drives running audio/video applications attempted to either match the drive's speed to the data rate requirement of the host application (just-in-time speed), or run it at the maximum drive speed, neither of which are energy-optimal in general. Starting from the theory of DC motors, we obtain a high-level power model of a disk drive. We then analytically obtain the speed profile (function of time) that minimizes the energy required to transfer a given amount of data from/to the drive, in a given amount of time. Based on a power model obtained by measurement from a commercial optical drive, it is estimated that the proposed speed control technique consumes 79%, 70% and 50% less energy for VCD, SVCD and DVD video playback, respectively, when compared to existing just-in-time CLV techniques. This work also provides an analytical framework to understand earlier observations that buffering multimedia data and employing CAV mode in disk drives is more energy-efficient.

Original languageEnglish (US)
Title of host publicationCASES 2004
Subtitle of host publicationInternational Conference on Compilers, Architecture, and Synthesis for Embedded Systems
PublisherAssociation for Computing Machinery
Pages93-103
Number of pages11
ISBN (Print)1581138903, 9781581138900
DOIs
StatePublished - Jan 1 2004
Externally publishedYes
EventCASES 2004: International Conference on Compilers, Architecture, and Synthesis for Embedded Systems - Washington, DC, United States
Duration: Sep 22 2004Sep 25 2004

Publication series

NameCASES 2004: International Conference on Compilers, Architecture, and Synthesis for Embedded Systems

Other

OtherCASES 2004: International Conference on Compilers, Architecture, and Synthesis for Embedded Systems
CountryUnited States
CityWashington, DC
Period9/22/049/25/04

Keywords

  • Disk drive
  • Low power
  • Multimedia
  • Speed control

ASJC Scopus subject areas

  • Engineering(all)

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