Patent ID: 8896953

Claim:
A disk storage apparatus comprising: storage devices having a nonvolatile cache area in which a part of consecutive data is temporarily stored and a recording area including recording units each comprising a predetermined number of tracks on a disk, the recording unit including user data writing areas to which logical block addresses are assigned and a spare writing area to which no logical block address is assigned; a writing part configured to write data in the recording area; and a controller configured to control the writing of the consecutive data in accordance with a write command including a write request and the logical block address, wherein the controller is configured to: write the consecutive data in the spare writing area by shingled magnetic recording (SMR), instead of the user data writing area which is specified by the logical block address and change the spare writing area to a new user data writing area to which the logical block addresses are assigned, if the write request is the sequential write request and the spare writing area is available, write the consecutive data in the cache area, instead of the user data writing area which is specified by the logical block address, if the write request is the sequential write request and the spare writing area is not available, and invalidate data in the user data writing area which is specified by the logical block address, after writing the consecutive data in one of the spare writing area and the cache area.