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IOMeter
IOMeter presents a good test case for both seek times and command queuing.

Western Digital has a history of releasing enterprise-optimized derivatives of its GreenPower drives, so it's a good thing the Caviar Green handles multi-user IOMeter workloads with aplomb. The Green may not come close to the transaction rates delivered by the Caviar Black or VelociRaptor, but it offers better performance than 7,200-RPM drives from Hitachi, Samsung, and Seagate.

IOMeter CPU utilization is low across the board.