Abstract: A disk device includes a disk medium, a magnetic recording head, a processor configured to control the magnetic recording head to write data to and read data from a plurality of tracks of the disk medium on a sector-by-sector basis, and a check value generation circuit configured to generate, for each of the plurality of tracks, check value data based on data stored in one or more sectors of the track. The processor controls the magnetic recording head to write check value data for a first track of the plurality of tracks in a first sector on the disk medium and check value data for a second track of the plurality of tracks in a second sector on the disk medium that is adjacent to the first sector.

Abstract: A disk device includes a disk medium, a magnetic recording head, a processor configured to control the magnetic recording head to write data to and read data from a plurality of tracks of the disk medium on a sector-by-sector basis, and a check value generation circuit configured to generate, for each of the plurality of tracks, check value data based on data stored in one or more sectors of the track. The processor controls the magnetic recording head to write check value data for a first track of the plurality of tracks in a first sector on the disk medium and check value data for a second track of the plurality of tracks in a second sector on the disk medium that is adjacent to the first sector.

Abstract: Upon receipt of a read command or a write command from an external device, a disk apparatus stores an obtained address as a primary address and a secondary address in an address storing unit, increments a counter value of the secondary address, and selects the secondary address of which the counter value indicates the largest number. Upon receipt of the read command for the primary address, the disk apparatus reads data specified by the primary address from a disk and stores it in a buffer memory in advance. Upon receipt of the read command, the disk apparatus sends the data from the buffer to the external device.

Abstract: According to one embodiment, a storage device includes a link information creation module and a read-ahead process module. The link information creation module creates link information for associating storage regions on a storage medium, which store a plurality of data included in a single file, in an order according to continuity of the plurality of data. The read-ahead process module performs a read-ahead of data stored in a storage region on the basis of the link information, the storage region being associated with a storage region of the storage medium which is designated by the data read request.

Abstract: Upon receipt of a read command or a write command from an external device, a disk apparatus stores an obtained address as a primary address and a secondary address in an address storing unit, increments a counter value of the secondary address, and selects the secondary address of which the counter value indicates the largest number. Upon receipt of the read command for the primary address, the disk apparatus reads data specified by the primary address from a disk and stores it in a buffer memory in advance. Upon receipt of the read command, the disk apparatus sends the data from the buffer to the external device.