Patent ID: 8082389

Claim:
A storage apparatus that provides to a host computer a logical device for storing data sent from said host computer, comprising: a nonvolatile memory for storing said data; a hard disk drive (HDD) for storing said data; a controller for controlling said nonvolatile memory and said HDD, wherein said controller configures said logical device with a first logical volume corresponding to said nonvolatile memory and a second logical volume corresponding to said HDD, in which said first logical volume is a primary volume and said second logical volume is a secondary volume, wherein said controller controls to manage a power mode of said HDD and an operating time of said HDD in power on mode, and wherein if said controller receives an access request to said logical device from said host computer, said controller controls to read/write data from/to said first logical volume, power on of said HDD and asynchronously copy data from said first logical volume to said second logical volume at a predetermined time period; and a memory that stores first information including at least one of a total number of power on/off of said HDD and a total operating time of said HDD, wherein said controller controls said power mode of said HDD based on said first information, so that said HDD is able to be used for a long time of duration of use.