Abstract: According to one embodiment, a memory device includes a third partial key write module, an encryption key write module, and a decryption module. The third partial key write module is configured to combine a second partial key received from the current host device with the first partial key in the partial key memory device and to write a generated third partial key into the volatile memory after the device authentication. The encryption key write module is configured to combine the third partial key with the second user authentication information and to write a generated encryption key into the volatile memory after the user authentication. The decryption module is configured to decrypt the encrypted data based on the encryption key in the volatile memory based on a read request received from the current host device and to output obtained data to the current host device when the user authentication has succeeded.

Abstract: According to one embodiment, a memory device includes a third partial key write module, an encryption key write module, and a decryption module. The third partial key write module is configured to combine a second partial key received from the current host device with the first partial key in the partial key memory device and to write a generated third partial key into the volatile memory after the device authentication. The encryption key write module is configured to combine the third partial key with the second user authentication information and to write a generated encryption key into the volatile memory after the user authentication. The decryption module is configured to decrypt the encrypted data based on the encryption key in the volatile memory based on a read request received from the current host device and to output obtained data to the current host device when the user authentication has succeeded.

Abstract: According to one embodiment, a controller that controls a data storage device provided with a storage module that stores data encrypted with a first key includes an input/output module, encryption/decryption modules, and a connector. The input/output module manages data input and output between the storage module and a host. The encryption/decryption modules are switched to function as an encryptor or a decryptor. The connector changes connection between the encryption/decryption modules and the host. When encrypted data is backed up, one of the encryption/decryption modules is switched to function as a decryptor, while the other is switched to function as an encryptor. The decryptor, the encryptor, and the host are connected in series. The encrypted data is decrypted by the decryptor with the first key and is then encrypted by the encryptor with a second key to be output to the host.

Abstract: A magnetic head support device is characterized in that a first magnetic head is supported such that it inclined with respect to a surface of a flop disk, and a second magnetic head is supported such that it moves parallel to the other surface of the floppy disk. The second magnetic head is mounted on a carriage of the device via a support element. A movable portion of the support element on which the second magnetic head is mounted is coupled by two parallel gimbal plates to a stationary portion of the support element connected to the carriage.

Abstract: Disclosed is a magnetic head support assembly for a floppy disc device, in which the pressure of a spring to a magnetic head against a floppy disc is finely adjusted so as to apply a predetermined pressure thereto and to obtain an excellent contact condition between the magnetic head and magnetic disc.