Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2008-03-04
2008-03-04
Sparks, Donald (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S114000, C711S152000, C711S112000, C711S113000
Reexamination Certificate
active
07340576
ABSTRACT:
A disk array controller reliably detects disk drive power-on-reset events that may cause a disk drive that has uncommitted write data stored in its cache to lose such data. The methods for detecting the power-on-reset events include operating the disk drives in an ATA security mode in which a power-on-reset of a disk drive will cause the drive to enter a locked state in which data transfer commands are aborted; and tracking power cycle count attributes of the disk drives over time. When a disk drive power-on-reset event is detected, the disk array may be efficiently maintained in an operational state by re-executing or “replaying” a set of write commands that are cached within the disk array controller. The invention is also applicable to single-disk-drive storage systems.
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8-page document titled “AMBIOS8 Hard Disk Security,” version 1.1, dated Nov. 26, 2002, downloaded from www.ami.com.
Harris Richard L.
Stonelake Paul R.
Tang Alex Ga Hing
Therene Christophe
Applied Micro Circuits Corporation
Knobbe Martens Olson & Bear LLP
Sparks Donald
Vo Thanh D
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