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A magnetic disk storage system is described which moves the magnetic head arm actuator in a systematic fashion to prevent the magnetic heads from remaining stationary over the same track on a disk surface.
English (United States)
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Actuator Motion Control Feature
A magnetic disk storage system is described which moves the magnetic head
arm actuator in a systematic fashion to prevent the magnetic heads from
remaining stationary over the same track on a disk surface.
Damage to a magnetic disk and deteriorated performance may result by
magnetic heads remaining stationary over a given set of tracks for extended
periods of time. To avoid this possible deteriorated performance a timing system
is provided to monitor the movement of the actuator. When the actuator has
been idle for a predetermined period of time, a signal is generated which directs
the actuator to do a seek, equivalent to a minimum chosen distance. If no seek
activity is initiated within the chosen period of time, the process is repeated. The
system is designed to provide the following functions in sequence when the
timing system times out with the actuator idle. A busy signal is placed on the
incoming line to the device, the actuator is moved a specified distance, the
position register is updated, the busy signal for incoming lines to the device is
removed, and the timing system is reset. A seek command before the timer
times out causes the timing system to be reset.