Patent ID: 8447927

Claim:
A storage system comprising: a storage device that includes a storage medium capable of storing data; and a control device that is connected to an upstream-side device, scans the storage device, writes the data in the storage device on the basis of a request provided from the upstream-side device, and reads the data from the storage device on the basis of a request provided from the upstream-side device; wherein the control device determines whether or not the data is being written in or read from the storage device on the basis of the interested request provided from the upstream-side device, and when the data is being written or read, scans the storage medium at intervals of a first time in a first direction that is either a direction in ascending order of logical block addresses of the storage medium or a direction in descending order of the logical block addresses of the storage medium, and the storage device determines whether or not the data is written or read on the basis of the interested request provided from the upstream-side device during a time period from a time earlier by a second time than a current time to the current time, and when the data is not written and read during the time period, scans the storage medium in a second direction that is the reversed direction of the first direction.