Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Taichiro Yamanaka

Hironobu Miyamoto

Yoko Masuo

Yasuto Aramaki

Yoshiyuki Kudoh

Tatsuaki Iwata

Hiromi Sakata

Daisuke Mito

Mika Fujishiro

Hiroki Udagawa

According to one embodiment, a server device includes a memory and a processor. The memory stores verification information. The processor accepts a request to transmit a certificate number, generates information in which identification information of one of storage devices from which data is to be erased, a public key, a secret key, and the certificate number are associated with one another, transmits the certificate number, performs verification using an authenticator transmitted by the one storage device and verification information, generates, based on a result of the verification, an erasure certificate that includes the identification information and the certificate number and is signed using the secret key, and transmits the erasure certificate.

System, server device, and storage device

According to one embodiment, a data storage device includes a first controller, a second controller, and a third controller. The first controller performs a control operation of writing data of a first data unit to a storage area in a flash memory and reading the data of the first data unit from the storage area. The second controller carries out migration processing of measuring a data amount of valid data stored in storage areas of a second data unit that is a data erase processing unit.

Data storage device, memory control method, and electronic device with data storage device

A storage device includes a non-volatile memory having a plurality of storage areas. Received data is encrypted with a first cryptographic key and stored in one of the storage areas. Upon receiving an request from a host, a key processor replaces the first cryptographic key used to encrypt data stored on a specified one of the non-volatile memories with a different cryptographic key not previously used for any of the storage areas by generating a second cryptographic key, converting the previously used keys into first value by an operation, converting the candidate key into a second value by the same operation. The first and second values are compared, and when the first information is not the same as the second information, the second cryptographic key replaces the first cryptographic key, and when not, the second cryptographic key is discarded and a new second cryptographic key generated.

Storage device

According to one embodiment, a memory device includes a memory, a memory interface, a command generator, an access command returning module and a command progress manager. The memory interface accesses the memory in parallel in accordance with access commands. The command generator speculatively issues access commands to the memory interface. The access command returning module returns access commands already issued to the memory interface and unexecuted at a time of occurrence of an error, through corresponding purge responses. The command progress manager updates command progress management information such that the command progress management information indicates the oldest one of the unexecuted access commands. The command generator reissues the returned unexecuted access commands to the memory interface based on the updated command progress management information.

Memory device configured to execute plural access commands in parallel and memory access method therefor

According to one embodiment, a command generator sequentially and speculatively issues channel-by-channel access commands to a memory interface in a predetermined access process. A purger returns a series of unexecuted already-issued access commands using a purge response if an error occurs in any of memory accesses via a plurality of channels. A command progress manager updates command progress information such that the command progress on each of the plurality of channels returns to a position specified in an oldest access command of a series of the returned access commands issued to the channel. The command generator issues the channel-by-channel access commands including the oldest access command to the memory interface based on the updated command progress information.

Growing community of inventors

Hino, Japan

Taichiro Yamanaka