【発明の名称】磁気ディスク装置

Japanese Patent JP3242407

B2

A magnetic disk apparatus includes at least two systems, each system having at least one power unit and at least one battery unit ancillary to the power unit. The disk apparatus also includes at least one common power unit having a pluralities of batteries attached thereto connected in common with the two systems. Patrol control means (PC) is operatively connected to a power control unit (0) of one system and a power control unit (1) of another system for giving a control signal during a battery monitoring operation and a priority order to the battery monitoring operation. The patrol control means monitors the function of the common batteries attached to the common power unit and, further, when the common batteries are incorporated in the magnetic disk apparatus, controls the simultaneous monitoring of the common batteries and the time of incorporation of the common batteries into the magnetic disk apparatus. When one of the at least two systems is monitoring the common batteries, the power control unit of the one of the at least two system sends a master signal MAS to the patrol control means (PC) indicating that the one of the at least two systems is monitoring the common batteries, and the patrol control means sends an other-system patrol signal O-TST to the other of the at least two system indicating that the one of the two at least two system is monitoring the common batteries.

Hiyoshi Yoshitaka
Hiroyuki Tanaka
Takao Hakamaya
Masayuki Korikawa
Koji Tsurumi
Tetsuro Kudo
Yuichi Ogawa

JP51780493A

December 25, 2001

May 26, 1993

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富士通株式会社

G06F1/18; G06F1/26; G06F1/30; G11B17/22; G11B19/04; G11B19/20; G11B33/12; (IPC1-7): G06F3/06; G06F1/00

JP2181210A
JP4123118A
JP61151724A
JP6450719A
JP6197730A
JP478062A
JP59191631A
JP1255099A
JP2159932A

【文献】米国特許4747041(US,A)
【文献】米国特許4312035(US,A)

Shoichi Ui (4 others)

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