Data integrity assurance in a disk drive upon a power failure

Details Data integrity assurance in a disk drive upon a power failure Data integrity assurance in a disk drive upon a power failure

1992-04-09

1994-10-25

Beausoliel, Jr., Robert W.

Boots, shoes, and leggings

395425, 3642642, 364DIG1, 371 14, G06F 1100

Patent

active

053597281

ABSTRACT:
A disk drive package includes read/write circuits, a disk drive mechanism and a microprocessor. The microprocessor has a dedicated function input and an interrupt input. The dedicated function input is accessible through an external connector in the disk drive package, but the interrupt input has no direct external access. The microprocessor is programmed to examine the dedicated function input only upon power-up to determine if it has been enabled. The disk drive package is modified to include a circuit that couples the dedicated function input to the interrupt input to the microprocessor. A power supply provides a power fail imminent signal to the dedicated function input, and because the dedicated function input is connected to the interrupt input, such signal causes an interrupt to occur in the operation of the disk drive whereby any write to disk in progress is completed prior to a power fail event.

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Baker et al., A priority event monitor for an interrupt-driven microprocessor, Mar. 1991, pp. 905-908, IEEE.

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