Appeal No. 1998-0927
Application No. 08/343,939
The disclosed invention relates to a digital servo
control method for controlling a voice coil motor for moving a
head to a target track on a disk recording media. When one of
a search mode, a transition mode or a track following mode is
selected, one of a search mode interrupt service routine, a
transition mode interrupt service routine or a track following
mode interrupt service routine, respectively, is enabled as a
result of a moving distance from a track position to the
target track.
Claim 15 is the only independent claim on appeal, and it
reads as follows:
15. A digital servo control method for controlling a
voice coil motor for moving a head to a target track for every
predetermined sampling period in a data storage system using
disk recording media, said method comprising the steps of:
reading track position information for detecting a gray
code of a current track on said disk recording media to derive
a track position of said head;
selecting a target track for determining a moving
distance for moving said head from said track position to said
target track;
selecting one of a search mode, a transition mode and a
track following mode as a result of said moving distance; and
enabling one of a search mode interrupt service routine,
a transition mode interrupt service routine and a track
following mode interrupt service routine for applying a
control signal to said voice coil motor according to the
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