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

Kenichi Kaki

Kunihiro Katayama

Takashi Tsunehiro

Hajime Yamagami

Takeshi Furuno

Yoshihiro Hayashi

Kouichi Terada

Jun Kitahara

Tsunehiro Tobita

Takashi Totsuka

Takeshi Suzuki

Takeshi Wada

Ryuichi Hattori

Yukihiro Seki

Takashi Kikuchi

Takao Okubo

Masamichi Kishi

Shigeru Kadowaki

Manabu Saito

Yosio Takaya

Kazunori Furusawa

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 flash memory based file memory device built in an information processing apparatus enables fast file access. The file memory device is provided with a parallel arrangement of memory element groups having a unit erasure block size greater than the data bus width of the memory device and a data access width smaller than the data bus, a file division unit for dividing file data that consists of one or more unit storage data blocks into combined blocks that consists of a combination of arbitrary unit storage data blocks, a data distribution unit for combining arbitrarily data on the data bus in terms of the unit data size equal to the data access width and making the combined data correspondent to an arbitrary combination of memory element groups equal in number to the unit size data, and a control unit for controlling the data distribution unit such that each combined block is stored in the file memory device by being correspondent to one of the arbitrary combinations of memory element groups.

File memory device and information processing apparatus using the same

Growing community of inventors

Yokohama, Japan

Kenichi Kaki