Renesas Technology Corp.

Hitachi, Ltd.

Solid State Storage Solutions LLC

S4, Inc.

Kouichi Terada

Kunihiro Katayama

Takashi Tsunehiro

Kenichi Kaki

Takeshi Furuno

Hajime Yamagami

Yoshihiro Hayashi

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

Growing community of inventors

Yokohama, Japan

Kouichi Terada