Hitachi, Ltd.

Renesas Technology Corp.

Hitachi Keiyo Engineering Co., Ltd.

Solid State Storage Solutions LLC

Other

Hitachi Ulsi Engineering Corp.

S4, Inc.

Hitachi Engineering Co., Ltd.

Hitachi Ulsi

Takashi Tsunehiro

Kunihiro Katayama

Kenichi Kaki

Hajime Yamagami

Takeshi Furuno

Yoshihiro Hayashi

Kouichi Terada

Takashi Totsuka

Nagamasa Mizushima

Jun Kitahara

Koichi Kimura

Takeshi Suzuki

Takeshi Wada

Tsunehiro Tobita

Ryuichi Hattori

Yukihiro Seki

Takashi Kikuchi

Takao Okubo

Masamichi Kishi

Shigeru Kadowaki

Manabu Saito

Yosio Takaya

Takatoshi Kato

Akifumi Suzuki

Motoyasu Tsunoda

Tomihisa Hatano

Toshio Tanaka

Toshio Sugano

Hideki Osaka

Susumu Hatano

Kazuya Ito

Toyohiko Komatsu

Junji Ogawa

Makoto Kayashima

Shinya Iguchi

Kazushi Nakagawa

Hiroshi Kurihara

Atsushi Kawamura

Kenta Ninose

Hideo Nakamura

Kouki Noguchi

Hideyuki Koseki

Shigeo Homma

Junichi Maruyama

Shinji Kimura

Satoshi Kikuchi

Akiyoshi Hashimoto

Haruji Ishihara

Satoshi Kawamura

Go Uehara

Hiromichi Itoh

Shigeo Tsujioka

Hiromi Isokawa

Yoshiaki Kitazume

Masaki Mega

Toshiyuki Iseki

Kohichi Nakatani

Takuji Itou

Fumio Yoshioka

A failure region is specified when a failure occurs in a non-volatile semiconductor memory. When a device controller reads data stored in a specific page in a plurality of non-volatile semiconductor memories to detect an uncorrectable error (UE) of the data stored in the specific page, the device controller executes a diagnosis process including specifying a specific storage circuit that is a storage circuit including the specific page, reading data stored in a part of blocks of the specific storage circuit, and specifying, on the basis of a result of reading data stored in the block, a failure region in the specific storage circuit.

Memory device and storage apparatus

In a storage apparatus including a storage medium including a plurality of pages as a unit of reading and writing data, a first data block including a data block received from a higher-level device is generated, a second data block of a predetermined size including one or more undivided first data blocks is generated, a third data block in which a correction code is added to the second data block is generated, the third data block is stored in a page buffer, and one or more of the third data blocks stored in the page buffer is written in a page, which is a write destination, out of the pages of the storage medium.

Storage apparatus and data control method of storing data with an error correction code

A semiconductor storage device has a nonvolatile semiconductor memory comprised from multiple storage areas, and a controller, which is coupled to the nonvolatile semiconductor memory. The controller (A) identifies a storage area state, which is the state of a storage area, (B) decides, based on the storage area state identified in the (A), a read parameter, which is a parameter for use when reading data from a storage area with respect to a storage area of this storage area state, and (C) uses the read parameter decided in the (B) with respect to a read-target storage area and reads data from this read-target storage area.

Semiconductor storage device having nonvolatile semiconductor memory

A semiconductor storage apparatus comprises a memory controller and flash memories which include a plurality of blocks as storage areas. The memory controller is configured to manage a degree of deterioration and read frequency for each of the plurality of blocks. A reliability maintained period is calculated for each storage area based on the degree of deterioration and read frequency for each storage area of a flash memory, and refresh is executed on each storage area in a planned manner based on the calculated reliability maintained period by newly storing the data stored in a block in another block based on an obtained reliability maintained period. The memory controller may also be configured to execute verification on each block and, if the number of failure bits is larger than a predetermined threshold, execute refresh to store data which is stored in a verification target block in another block.

Semiconductor storage apparatus and method including executing refresh in a flash memory based on a reliability period using degree of deterioration and read frequency

A memory controller adds the redundant information that is used to correct an error for each of data of a predetermined length and stores the data into the nonvolatile memory in the case in which data is written to the nonvolatile memory, the memory controller reads data and the redundant information that has been added to the data from the nonvolatile memory in the case in which data is read from the nonvolatile memory, and the memory controller corrects an error based on the redundant information in the case in which the data includes an error. The memory controller stores data that is in a basic unit that is a unit of an error correction configured by the data of a predetermined length and the redundant information that is added to the data of a predetermined length into a plurality of predetermined pages in a dispersed manner.

Semiconductor storage device and control method of nonvolatile memory

Provided in one embodiment is a nonvolatile storage system having multiple nonvolatile storage media and a controller coupled to the multiple nonvolatile storage media. The controller has a storage area configured to store management information including probability management information denoting error probability information of a unit physical area in a nonvolatile storage medium, and an error correcting circuit configured to carry out coding and decoding by a low density parity check code. The controller, in a data read process, is configured to identify based on management information an error probability, uses the identified error probability to correct the read data using the error correcting circuit.

Non-volatile storage system compensating prior probability for low-density parity check codes

Disclosed is a secure remote access system for improving convenience of a user by utilizing a storage device including an anti-tampering device as a user authentication device in the secure remote access system for making access and execution of job while a user is making the encrypted communication to a server from an unspecified client. Usability can be improved and thereby the job executing function can be used smoothly at the internal and external sides of the working office by providing a server client system where the server can be manipulated remotely by distributing a storage device loading the authorized anti-tampering device to users, connecting the storage device to unspecified clients by users, and using the authentication information and application stored in the storage device. A remote access system having improved security and convenient during usage of client from the user can also be provided by reducing the secret information remaining in the manipulated client.

Remote access system, gateway, client device, program, and storage medium

A thin client terminal that can perform information processing in an off-line state is provided. A thin client terminalsends a request for registration of data to be used off-line and designation of application software to be used off-line to a management serverthrough a remote computer. The management serverregisters the data and application software according to the request. The thin client terminalrequests the management serverto acquire the requested data and application software, receives the data and application software, and stores the received data and application software into a storage medium

Application software and data management method, management system, and thin client terminal, management server and remote computer used therefor

A semiconductor disk wherein a flash memory into which data is rewritten in block unit is employed as a storage medium, the semiconductor disk including a data memory in which file data are stored, a substitutive memory which substitutes for blocks of errors in the data memory, an error memory in which error information of the data memory are stored, and a memory controller which reads data out of, writes data into and erases data from the data memory, the substitutive memory and the error memory. Since the write errors of the flash memory can be remedied, the service life of the semiconductor disk can be increased.

Storage device employing a flash memory

A semiconductor storage apparatus is coupled with a system bus to receive a write request accompanied with first and second blocks of data, which are stored in nonvolatile semiconductor memories. A control device sends a first erase command to one of the nonvolatile memories to initiate a first internal erase operation of data within the nonvolatile memories. After the first erase command has been sent, the control device sends a second erase command to another one of the nonvolatile memories, to initiate a second internal erase operation of data within the other nonvolatile memory.

Semiconductor storage device

A device management system is provided which is used in a client/server architecture system, enabling safe sharing of a device without compromising user convenience. In a case where the device which is connected to a client is accessed from a server, in order that the device connected to the client can be used from the server by merely connecting the device to the client without performing another operation, a filter is provided on the client side, and a pseudo bus driver is provided on the server side. The filter in the client exclusively controls client operations to the device and server operations to the device. The pseudo bus driver virtually functions as a device driver between a communication unit for the client and the application in the server.

Device management system

A invented computer system has a plurality of computer boards; a plurality of terminals, each of which is coupled to each of the computer boards respectively via a network; a storage device having a plurality of storage areas, which is coupled to each of the computer boards; and a management computer; and wherein the management computer manages a correspondence between a user information and the storage area, and when a use request of the computer board is transmitted from a terminal, the management computer selects a usable computer board to turn on a power, reads information necessary to start the computer board from the storage corresponding to the transmitted user information, allows the computer board to start based on the read information, and notifies the terminal of information on the started computer board and identification information on the network allocated to the started computer board.

Computer system for selecting a useable computer board to power on and accessing corresponding storage based on terminal request that includes user information

Growing community of inventors

Ebina, Japan

Takashi Tsunehiro