Hitachi, Ltd.

Manabu Ishida

Yohsuke Ishii

Katsuya Tanaka

Akiyoshi Hashimoto

Tetsuya Uemura

When a file server is to create data that does not permit falsification in an external storage, it is not possible to guarantee that the rewriting of this data can be prevented from a computer connected to the external storage without going through a file server. Provided is a storage system configured from a first storage having a file I/O processing unit and a second storage connected to this first storage, wherein the first storage includes a unit for requesting a change of access authority to the storage area in the own storage and in the second storage provided to the own storage. An access request to a storage area in a second storage from a computer connected to a second storage without going through a file I/O processing unit is restricted based on the change of access authority executed by the second storage upon receiving the request from the first storage.

Storage apparatus for preventing falsification of data

Provided is a storage system including: a nonvolatile memory which stores and erases data for respective blocks; and a controller for inputting and outputting the data to and from the nonvolatile memory, wherein: the storage system has a storage area including: a rewritable area where a stored data can be erased; and a write-once area where the stored data cannot be erased; and the controller determines a block belonging to the rewritable area based on an attribute of the block, and performs a wear leveling process and a reclamation process only on the block determined as belonging to the rewritable area.

Storage system using a flash memory partitioned with write-once and rewritable blocks

The version management method according to the present invention by a computer system comprises a repository serverand a user terminal. The repository serverexecutes a procedure that the file to be updated within the user repositoryare updated by the user terminal, a procedure that the files to be updated within the user repositoryare updated so as to write the files to be updated on the system repository, and a procedure that the file to be updated within the system repositoryare read by the arbitrary user terminal

Growing community of inventors

Yokohama, Japan

Manabu Ishida