Kabushiki Kaisha Toshiba

Kioxia Corporation

Toshiba Memory Corporation

Junji Yano

Kosuke Hatsuda

Hidenori Matsuzaki

Shinichi Kanno

Toshikatsu Hida

Hirokuni Yano

Kazuya Kitsunai

Shigehiro Asano

Hiroki Matsudaira

Wataru Okamoto

Ryoichi Kato

Takehiko Kurashige

Tsukasa Miyawaki

Masakazu Iwashita

Michio Kaji

Masakazu Gotou

Masami Atoh

A memory system includes a management-information restoring unit. The management-information restoring unit determines whether a short break has occurred referring to a pre-log or a post-log in a NAND memory. The management-information restoring unit determines that a short break has occurred when the pre-log or the post-log is present in the NAND memory. In that case, the management-information restoring unit determines timing of occurrence of the short break, and, after selecting a pre-log or a post-log used for restoration, performs restoration of the management information reflecting these logs on a snapshot. Thereafter, the management-information restoring unit applies recovery processing to all write-once blocks in the NAND memory, takes the snapshot again, and opens the snapshot and the logs in the past.

Memory system storing management information and method of controlling same

A memory system includes a nonvolatile memory including a plurality of blocks as data erase units, a measuring unit which measures an erase time at which data of each block is erased, and a block controller which writes data supplied from at least an exterior into a first block which is set in a free state and whose erase time is oldest.

Memory system and control method thereof

A memory system includes a volatile first storing unit, a nonvolatile second storing unit in which data is managed in a predetermined unit, and a controller that writes data requested by a host apparatus in the second storing unit via the first storing unit and reads out data requested by the host apparatus from the second storing unit to the first storing unit and transfers the data to the host apparatus. The controller includes a management table for managing the number of failure areas in a predetermined unit that occur in the second storing unit and switches, according to the number of failure areas, an operation mode in writing data in the second storing unit from the host apparatus.

Memory system

Growing community of inventors

Kanagawa, Japan

Junji Yano