Hewlett-packard Development Company, L.P.

Hewlett-packard Company

Stephen G Uhlmann

Kimon Berlin

Kenneth G Richardson

Robert Lee Crane

Mark E Nash

Erik R Habbinga

Mark E Mills

Mark Millican

An example includes periodic access of a hardware resource of a computer by instructions in firmware of the computer that are executed by an interpreter in the context of the operating system without a driver. The access occurs in response to a periodic interrupt generated by a timer.

Periodic access of a hardware resource

Example embodiments disclosed herein relate to identifying a target fan connected to a computing device. In example embodiments, the target fan may be identified based on a fan speed profile of the target fan.

Identifying a fan connected to a computing device

A method for reliably measuring preformatted servo patterns, on a magnetic tape, for positioning a magnetic head. The tape has constant frequency stripes marking servo pattern areas. The drive reading the preformatted tape has a read channel amplifier with automatic gain control (AGC). When a stripe is detected, AGC is enabled. Before leaving a stripe, AGC is placed on hold. The amplitudes of two servo bursts are then measured with a gain that has been calibrated by a signal from a stripe. During the time AGC is enabled, the amplifier peak output is limited to less than half the maximum amplifier peak output. The servo pattern signal amplitude is about twice the signal amplitude of a stripe, so that servo patterns are measured with almost the maximum signal-to-noise ratio. When a stripe is detected, a counter counts pulses resulting from the stripe signal, for a fixed time, to ensure that the stripe detection is valid. If the stripe is qualified, the servo pattern measurements are used for head alignment adjustment. If the strip is not qualified, the servo pattern measurements are discarded.

Accurate measurement of preformatted track servo patterns by a magnetic

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Loveland, CO, United States of America

Stephen G Uhlmann