Hitachi, Ltd.

Yuichi Otani

Hidehiko Iwasaki

Tsutomu Sukigara

Mitsuhiko Oguchi

Takashi Takenaka

Hideaki Amano

Teruyoshi Higashiya

Masayuki Katsumoto

Hiroyuki Sugimoto

Tetsuji Higashijima

Tuneyuki Hasegawa

Kinya Eguchi

Mituhiko Oguchi

Takashi Hamada

A method and system which prevents starting-up problems in plural magnetic disk storage devices included in a disk array system during restart following halt of the magnetic disk storage devices after long term operation. The disk array system includes the plural magnetic disk storage devices, a microprocessor unit (MPU) which controls the magnetic disk storage devices, a control memory, a parity calculator, and cache memory. The control memory contains a operation time control table in which a tolerable continuous operation time Ti and a halt time Ts are stored. Each of the magnetic disk storage devices is intentionally stopped individually for the halt time Ts at time interval of the tolerable continuous operation time Ti. A request for reading data from one magnetic disk storage device under halt is responded to by using a data recovery function, while a request for writing data to a magnetic disk storage device under halt is responded to by writing data to an alternate spare magnetic disk storage device or memory.

Magnetic disk storage device control method, disk array system control method and disk array system

Magnetic disk storage device control method, disk array system control

A magnetic disc apparatus includes a casing for defining a sealed space, a magnetic disc disposed within the space, a spindle to which the magnetic disc is fixed, a motor for rotating the spindle, a flying head slider for writing and/or reading information in and/or from the magnetic disc and a carriage for translating the flying head slider. The magnetic disc apparatus incorporates an organic chemical compound capable of suppressing siloxane from being chemically changed to silicon oxide. The organic chemical compound contains at least one of monoalkyl-substituted benzene, dialkyl-substituted benzene, trialkyl-substituted benzene, fatty acid, fatty ester, alkyl ester of aromatic acid, thiazoles and phenols.

Magnetic disc apparatus and magnetic disc

Growing community of inventors

Yokohama, Japan

Yuichi Otani