US 6,600,620 B1Granted

Self-servo writing a disk drive by propagating interleaved sets of timing clocks and servo bursts during alternate time intervals

AssigneeWestern Digital Technologies, Inc.

InventorsMohamad T. Krounbi, John Cuda, Jack M. Chue, Robert Leslie Cloke, David Price Turner, Gary L. Dunbar

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Abstract

The present invention may be regarded as a self-servo writing disk drive comprising a head having a read element radially offset from a write element. During a first time interval, the read element is positioned over a first radial location to read first A clock data to generate first circumferential timing information and first A servo bursts to generate first position control information. The first position control information is used for positioning the write element over a second radial location, and the first circumferential timing information is used for writing second B clock data and second B servo bursts to the second radial location. During a second time interval, the read element is positioned over the first radial location to read first B clock data to generate second circumferential timing information and first B servo bursts to generate second position control information. The second position control information is used for positioning the write element over the second radial location, and the second circumferential timing information is used for writing second A clock data and second A servo bursts to the second radial location.

Claims16

Dependent claims

A self-servo writing disk drive comprising:

(a) a disk comprising a first radial location and a second radial location, the first radial location for storing first A clock data interleaved with first B clock data and first A servo bursts interleaved with first B servo bursts, the second radial location for storing second A clock data interleaved with second B clock data and second A servo bursts interleaved with second B servo bursts;
(b) a head comprising a read element and a write element, wherein the read element is radially offset from the write element;
(c) a memory for storing a self-servo writing program;
and
(d) a control system responsive to the self-servo writing program for performing the steps of:
during a first time interval:
positioning the read element over a region of the first radial location;
using the read element to read from the region of the first radial location at least part of the first A clock data to generate first circumferential timing information;
using the read element to read from the region of the first radial location at least part of the first A servo bursts to generate first position control information;
using the first position control information to position the write element over the second radial location;
and
using the first circumferential timing information to write at least part of the second B clock data and at least part of the second B servo bursts to the second radial location;
during a second time interval:
positioning the read element over the region of the first radial location;
using the read element to read from the region of the first radial location at least part of the first B clock data to generate second circumferential timing information;
using the read element to read from the region of the first radial location at least part of the first B servo bursts to generate second position control information;
using the second position control information to position the write element over the second radial location;
and
using the second circumferential timing information to write at least part of the second A clock data and at least part of the second A servo bursts to the second radial location.

16 more elements

A method of self-servo writing a disk drive, the disk drive comprising:

a disk comprising a first radial location and a second radial location, the first radial location for storing first A clock data interleaved with first B clock data and first A servo bursts interleaved with first B servo bursts, the location for storing second A clock data interleaved with second B clock data and second A servo bursts interleaved with second B servo bursts;
a head positioned radially over the disk, the head comprising a read element and a write element wherein the read element is radially offset from the write element;
the method of self-servo writing the disk drive comprising the steps of:
during a first time interval:
positioning the read element over a region of the first radial location;
using the read element to read from the region of the first radial location at least part of the first A clock data to generate first circumferential timing information;
using the read element to read from the region of the first radial location at least part of the first A servo bursts to generate first position control information;
using the first position control information to position the write element over the second radial location;
and
using the first circumferential timing information to write at least part of the second B clock data and at least part of the second B servo bursts to the second radial location;
during a second time interval:
positioning the read element over the region of the first radial location;
using the read element to read from the region of the first radial location at least part of the first B clock data to generate second circumferential timing information;
using the read element to read from the region of the first radial location at least part of the first B servo bursts to generate second position control information;
using the second position control information to position the write element over the second radial location;
and
using the second circumferential timing information to write at least part of the second A clock data and at least part of the second A servo bursts to the second radial location.

14 more elements

Dependencies are inferred from the claim text.