BRIEF DESCRIPTION OF THE DRAWINGS
The present disclosure will become more fully understood from the detailed description and the accompanying drawings, wherein:
FIG. 1 is a functional block diagram of a disk drive according to the prior art;
FIG. 2 is a schematic representation of tracks and sectors in disk drives according to the prior art;
FIG. 3A is a functional block diagram of a disk drive that employs self-servo-write (SSW) methods according to the prior art;
FIG. 3B is a schematic representation of writing servo spirals according to the prior art;
FIG. 4A depicts radial movement of an actuator arm relative to rotating platters in a disk drive;
FIG. 4B depicts a skew angle that a read/write head makes relative to a circular track in a disk drive;
FIG. 4C is a graph of skew angle of a read/write head as a function of track radius;
FIG. 4D depicts a pivot angle at which a circular track intersects an arc along which an actuator arm moves in a disk drive;
FIG. 4E is a graph of pivot angle as a function of track radius;
FIG. 4F is a graph of variation in read-back frequency as a function of track radius when spirals prewritten in a disk drive are read;
FIG. 5A is a functional block diagram of a system for measuring actuator velocity at which spirals are prewritten in a disk drive according to the present disclosure;
FIG. 5B depicts frames in a spiral pattern;
FIG. 5C is a table showing exemplary frame sync counts counted at different actuator velocities;
FIG. 6 is a flowchart of a method for measuring actuator velocity at which spirals are prewritten in a disk drive according to the present disclosure;
FIG. 7A is a functional block diagram of a high definition television;
FIG. 7B is a functional block diagram of a vehicle control system;
FIG. 7C is a functional block diagram of a cellular phone;
FIG. 7D is a functional block diagram of a set top box; and
FIG. 7E is a functional block diagram of a media player.
Patent Application
20070206319
