Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Reexamination Certificate
2006-04-04
2006-04-04
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
C360S073030, C713S330000, C713S340000
Reexamination Certificate
active
07023642
ABSTRACT:
A storage system capable of reducing the start-up time of disk drives is provided. If a power source monitor circuit itself is normal (S93), the power source monitor circuit reads a detection signal from a detection circuit, and checks power sources (S94). If the power sources are normal (S95), all disks are spun up (S96). When the spin-up of all disks is completed (S98), processing is completed. If either of two power sources fails (S95), the power source monitor circuit reports the fact to a host control logical part (S99). The power source monitor circuit clears its internal counter to zero (S100) and issues a drive command to HDDs (S101). When the spin-up of all disks is completed (S103), processing is completed. If there is a disk which has not yet been spun up, the power source monitor circuit sets the internal counter to n+1 (S104) and returns to Step S101. N-number of HDDs are divided into groups respectively including six disks, six disks, four disks and one disk, and if the disks are driven in units of the groups, the power source monitor circuit sets the internal counter to n+Δn.
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Matsushige Hiromi
Ogawa Masato
Suzuki Hiroshi
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Habermehl James L
Hitachi , Ltd.
Hudspeth David
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