Disk drive accounting for sinusoidal offset between heads when executing a rotational position optimization algorithm

摘要

A disk drive is disclosed wherein a radial offset is measured between a first head and a second head at a plurality of points along a circumference of a corresponding first and second disk surface to generate a first plurality of radial offsets. A first radial offset is determined and a second radial offset is determined based on the first plurality of radial offsets, wherein the first radial offset corresponds to approximately a maximum in the first plurality of radial offsets and the second radial offset corresponds to approximately a minimum in the first plurality of radial offsets. A plurality of access commands are stored in a command queue, and a rotational position optimization (RPO) algorithm is executed to select a next access command to execute from the command queue, wherein the RPO algorithm is responsive to the first and second radial offsets.

主权项

1. A disk drive comprising:
a plurality of disk surfaces each comprising a plurality of data tracks; a plurality of heads including at least one head actuated over each disk surface; and control circuitry operable to:
measure a radial offset between a first head and a second head at a plurality of points along a circumference of a corresponding first and second disk surface to generate a first plurality of radial offsets;determine a first radial offset and a second radial offset based on the first plurality of radial offsets, wherein the first radial offset corresponds to approximately a maximum in the first plurality of radial offsets and the second radial offset corresponds to approximately a minimum in the first plurality of radial offsets;store a plurality of access commands in a command queue; andexecute a rotational position optimization (RPO) algorithm to select a next access command to execute from the command queue, wherein the RPO algorithm is responsive to the first and second radial offsets.