TY - GEN
T1 - Disk drive energy optimization for audio-video applications
AU - Rao, Ravishankar
AU - Vrudhula, Sarma
AU - Krishnan, Musaravakkam S.
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
KW - Disk drive
KW - Low power
KW - Multimedia
KW - Speed control
UR - http://www.scopus.com/inward/record.url?scp=27944486534&partnerID=8YFLogxK
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U2 - 10.1145/1023833.1023848
DO - 10.1145/1023833.1023848
M3 - Conference contribution
AN - SCOPUS:27944486534
SN - 1581138903
SN - 9781581138900
T3 - CASES 2004: International Conference on Compilers, Architecture, and Synthesis for Embedded Systems
SP - 93
EP - 103
BT - CASES 2004
PB - Association for Computing Machinery
T2 - CASES 2004: International Conference on Compilers, Architecture, and Synthesis for Embedded Systems
Y2 - 22 September 2004 through 25 September 2004
ER -