虽然1TB SATA驱动器和一个300 GB的光纤通道驱动器的实际功率差异相差不远，但瓦特/容量（单位容量的能耗）的成本差异极大。
While the actual wattage difference between a 1 TB SATA drive and a 300 GB Fibre Channel drive is marginal, the cost difference on a watt-per-capacity basis is significant.
瓦特是用来测量电路中消耗的功率的一种单位。
The watt is the unit for measuring the power expended in the circuit.
功率单位等于千分之一瓦特。
应用推荐