EXTERNAL STORAGE DEVICE AND INFORMATION PROCESSING SYSTEM WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To optimize an information processing system including an external storage device such as a hard disk device. SOLUTION: A performance parameter (such as spindle rotating speed, cache size) to determine performance of a hard disk is transmitted and received between the hard disk device 101 and a host device 113. The hard disk device 101 resets the indicated performance parameter when a setting request of the performance parameter is received from the host device 113. In addition, the host device 113 predicts execution time of commands to the hard disk device 101 based on parameter information received from the hard disk device 101 and rearranges the commands based on a prediction result.