US 9,070,396 B1Granted

Method and apparatus for initial self-servo writing based on writing timing tracks on a disk

AssigneeMarvell International Ltd.

InventorsSupaket Katchmart, David Liaw, Jerome F. Richgels, Henri Sutioso

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Abstract

Embodiments of the present disclosure provide a method of self-servo writing, the method comprising actions of positionally tracking a selected timing track of a data storage disk, wherein the selected timing track has one or more timing segments; synchronizing an angular position signal to rotation of the data storage disk based on at least one of the one or more timing segments of the selected timing track; specifying servo sector positions relative to the synchronized angular position signal; writing servo sectors to the data storage disk at the specified servo sector positions relative to the synchronized angular position signal; detecting one or more positional errors in timing segments of a next timing track of the data storage disk based at least in part on the synchronized angular position signal; and accounting for the detected one or more positional errors in writing subsequent servo tracks. Other embodiments are also described.

Claims20

Dependent claims

A method for writing a plurality of servo tracks onto a disk, wherein each servo track comprises one or more servo sectors, the method comprising:

rotating the disk at a constant angular velocity;
while the disk is rotating at the constant angular velocity, writing, via a read/write head, a sequence of tracks onto the disk, wherein each track of the sequence of tracks comprises timing information associated with the rotation of the disk;
based on timing information included in a first track of the sequence of tracks, synchronizing a signal to the rotation of the disk;
based on synchronizing the signal to the rotation of the disk, writing a first one or more servo sectors onto the disk;
detecting an error in timing information included in a second track of the sequence of tracks relative to the timing information included in the first track of the sequence of tracks;
based on (i) the detected error and (ii) the timing information included in the second track of the sequence of tracks, re-synchronizing the signal to the rotation of the disk;
and
based on re-synchronizing the signal to the rotation of the disk, writing a second one or more servo sectors onto the disk.

5 more elements

A disk drive comprising:

a disk;
a read/write head configured to, while the disk is rotating at a constant angular velocity, write a sequence of tracks onto the disk, wherein each track of the sequence of tracks comprises timing information associated with the rotation of the disk;
a data head positioned to read from and write to the disk;
and
a drive controller that is configured to
based on timing information included in a first track of the sequence of tracks, synchronize a signal to the rotation of the disk,
based on synchronizing the signal to the rotation of the disk, facilitate writing a first one or more servo sectors onto the disk,
detect an error in timing information included in a second track of the sequence of tracks relative to the timing information included in the first track of the sequence of tracks,
based on (i) the detected error and (ii) the timing information included in the second track of the sequence of tracks, re-synchronize the signal to the rotation of the disk, and
based on re-synchronizing the signal to the rotation of the disk, facilitate writing a second one or more servo sectors onto the disk.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/531,121Filed 3 Nov 2014 · continuation
Priority: 8 Aug 2011
Granted: 30 Jun 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 5/59666
Servo formatting: self servo writing
G11B 20/10222
Improvement or modification of read or write signals: clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
G11B
Information storage based on relative movement between record carrier and transducer