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In order to realize digital ecosystems, the total electric power consumption of servers to perform applications has to be reduced in information systems. Applications are classified into computation, communication, and storage based types. In the computation and communication based applications, CPU and communication resources of computers are mainly consumed, respectively. In the storage-based applications, the electric power is consumed to access to storage drives like hard disk drives (HDDs) and solid state drives (SSDs). In this paper, we measure how much electric power of a server computer is consumed to read and write data in types of storage drives. Then, we discuss a power consumption model of a computer to perform a storage-based applications based on the measurement of the power consumption of storage drives. Here, the power consumption rate of a server is maximum if at least one process is performed. Otherwise, the power consumption rate is minimum. This is a simple power consumption model.