Abstract: A user terminal reads out an encrypted content that is an authentication target from an encrypted content memory medium that stores the encrypted content in association with management information, assigns data forming the read encrypted content to the same hash function as that of a management apparatus, and computes a first hash value.

Abstract: A storage system and method are provided. The storage system includes, redundant disk arrays to which the same data is written and a write/read control section which controls writing and reading of data to and from the redundant disk arrays in response to a write request and a read request. The system includes disk rotation control section which continuously rotates disks of one of the disk arrays to perform a read process for written data and stops the rotation of disks of the other disk array when writing of data to the redundant disk arrays is completed, and further stops, when the write/read control section determines that the frequency of read requests from the host apparatus becomes less than a predetermined value after the completion of the writing of data, the rotation of the disks of the one of the disk arrays in accordance with the determination.