Abstract: According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to, when the magnetic head is in a second status before the magnetic head enters the first status, change setting in such a manner as to change a first memory area of a magnetic disk corresponding to the magnetic head in the second status among memory areas constituted of the plurality of magnetic disks to a second memory area in which a write count is limited.

Abstract: According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to, when the magnetic head is in a second status before the magnetic head enters the first status, change setting in such a manner as to change a first memory area of a magnetic disk corresponding to the magnetic head in the second status among memory areas constituted of the plurality of magnetic disks to a second memory area in which a write count is limited.

Abstract: According to one embodiment, controller and a device includes A controller includes: a command completion recognizer 33 recognizes that an SDB FIS can be sent after the completion of data transfer according to the FPDMA command between a host apparatus and the same; an R_RDY response suppressing control signal generator 35 generates an R_RDY response suppressing control signal based on a recognition result from the command completion recognizer; an R_RDY response suppresser 41 suppresses an R_RDY response with respect to X_RDY received from the host apparatus in response to the R_RDY response suppressing control signal; and an SDB FIS sender 34 sends an SDB FIS to the host apparatus after the R_RDY response suppression control.

Abstract: According to one embodiment, a storage apparatus includes: an encryption key generation information generator configured to generate encryption key generation information used to generate an encryption key based on information from a host computer; an encryption key generator configured to generate the encryption key based on the encryption key generation information; an initialization data encryption module configured to encrypt initialization data of a storage medium received from the host computer using the encryption key; a decryption module configured to decrypt data read from the storage medium using a decryption key corresponding to the encryption key; a comparator configured to compare data decrypted by the decryption module and the initialization data; and a write processor configured to permit, when the comparator determines that the data decrypted by the decryption module and the initialization data match with each other, to write user data in the storage medium.

Abstract: A disk storage device stores write data in a cache area of a data buffer according to a write command from a host, reports write completion to the host, and then writes the write data in the cache area to a storage medium. The disk storage device stores the write data stored in the data buffer in a save area created on the storage disk in response to the reception of a command which requires integrity, other than a write command, and reports a response to the host. Therefore processing time of this command and response time to the host can be decreased, while maintaining the safety of the write data.

Abstract: A disk storage device stores write data in a cache area of a data buffer according to a write command from a host, reports write completion to the host, and then writes the write data in the cache area to a storage medium. The disk storage device stores the write data stored in the data buffer in a save area created on the storage disk in response to the reception of a command which requires integrity, other than a write command, and reports a response to the host. Therefore processing time of this command and response time to the host can be decreased, while maintaining the safety of the write data.

Abstract: The write cache control unit stores data in the buffer memory in response to a write command from a higher-level apparatus to respond a normal ending of the command, and then writes the data in the buffer memory on the disk medium. The vibratory environment measuring unit measures an environment under which a vibration is applied to the apparatus. When an abnormal vibratory environment under which writing on the disk medium likely fails is determined from a measured environment by the vibratory environment measuring unit, the vibration countermeasure processing unit disables the write cache control unit, and if the write cache data remains in the buffer memory at that time, writes the data in the temporary storage area, and if the abnormal vibratory environment is not determined, writes back the data to the original position on the disk medium.