Source: https://patents.google.com/patent/US6751035
Timestamp: 2018-03-25 01:38:17
Document Index: 267657408

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

US6751035B1 - Method and system for initializing patterned media - Google Patents
Method and system for initializing patterned media Download PDF
US6751035B1
US6751035B1 US09863394 US86339401A US6751035B1 US 6751035 B1 US6751035 B1 US 6751035B1 US 09863394 US09863394 US 09863394 US 86339401 A US86339401 A US 86339401A US 6751035 B1 US6751035 B1 US 6751035B1
US09863394
A patterned media having recordable and non-recordable regions is initialized by first erasing (e.g. DC magnetizing) at least a portion of the recordable regions. At least one offset may then be determined. The at least one offset may compensate for a read to write delay in the electronics and/or at least one delay caused by the space separation between a read and a write head. A plurality of position error signal (PES) bursts may then be written on at least a portion of the recordable regions. During the write process, the previously written PES bursts are read and used to determine PES signals (e.g. servo signals) in order to guide the write head while writing new PES bursts. Magnetically written gray code may then be written on the media. The magnetically written gray code may be used to define a track number for the data tracks with no eccentricity.
This patent application is a continuation-in-part of commonly assigned U.S. patent application Ser. No. 09/591,546, filed Jun. 8, 2000, which claims the benefit of U.S. Provisional Application No. 60/138,258 filed Jun. 8, 1999, U.S. Provisional Application No. 60/138,255 filed on Jun. 8, 1999, U.S. Provisional Application No. 60/138,257 filed on Jun. 8, 1999, U.S. Provisional Application No. 60/138,256 filed on Jun. 8, 1999, U.S. Provisional Application No. 60/143,482 filed on Jul. 12, 1999, U.S. Provisional Application No. 60/150,122 filed on Aug. 20, 1999, and U.S. Provisional Application No. 60/150,123 filed on Aug. 20, 1999. The subject matter of these related applications are incorporated herein by reference.
In accordance with the present invention, a method and system are disclosed for initializing patterned media. The process begins by DC initializing (i.e. erasing) at least a portion of the recordable regions on the patterned media. At least one offset may then be determined. The at least one offset compensates for at least one delay. For example, the at least one offset may compensate for delays in the electronics, one example being a read to write delay. Furthermore, the at least one offset may compensate for at least one delay caused by the space separation between at least one write head and at least one read head.
To facilitate an understanding of the present invention, it is described hereinafter in the context of a specific embodiment. In particular, reference is made to the implementation of the invention in a patterned magnetic hard disk media for a hard disk drive. It will be appreciated, however, that the practical applications of the invention are not limited to this particular embodiment. Rather, the invention can be employed in other types of magnetic recording media, one example being magneto-optical hard disk media.
1. A method for initializing patterned media, wherein the patterned media includes recordable and non-recordable regions, the method comprising:
initializing at least a portion of the recordable regions;
determining at least one offset to compensate for at least one delay; and
writing data on at least a portion of the initialized recordable regions, wherein at least a portion of the previously written data is used as a guide when writing new data on the at least a portion of the initialized recordable regions.
2. The method of claim 1 further comprising the step of writing a first set of gray code on a portion of the initialized recordable regions after performing the step of writing data on at least a portion of the initialized recordable regions.
writing at least one test mark on at least a portion of the initialized recordable region;
determining the position of the at least one write head and at least one read head on the patterned media at the time of writing the test mark;
determining when the at least one read head detects a first edge of the test mark;
determining the position of the at least one read head on the patterned media at the time of detecting the first edge of the test mark;
determining when the at least one read head detects a second edge of the test mark;
determining the position of the at least one read head on the patterned media at the time of detecting the second edge of the test mark; and
determining the at least one offset by using at least a portion of the values determined in the previous steps.
8. The method of claim 7 wherein the step of writing data on at least a portion of the initialized recordable regions comprises the step of writing a plurality of position error signal (PES) bursts on the at least a portion of the initialized recordable regions, wherein at least a portion of the previously written PES bursts are used as a guide when writing new PES bursts on the at least a portion of the initialized recordable regions.
a pattern generator connected to a write read for generating a data pattern on the patterned media;
a delay circuit connected to the patterned generator for providing at least one time delay when the write head is writing data on the patterned media;
at least one detector connected to a read head for detecting at least one particular data mark when the read head is reading from the patterned media; and
an interval detector connected to the read head for determining at least one offset to compensate for at least one delay.
a data read/write channel connected to the read head;
a channel controller connected to the data read/write channel;
a drive microprocessor controller connected to the channel controller;
a DSP controller connected between the drive microprocessor controller, the pattern generator, and the at least one detector; and
a drive interface controller connected to the drive microprocessor controller.
14. The system of claim 12 wherein the data pattern comprises a first set of gray code.
US09863394 1999-06-08 2001-05-23 Method and system for initializing patterned media Active 2021-12-02 US6751035B1 (en)
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US09863394 US6751035B1 (en) 1999-06-08 2001-05-23 Method and system for initializing patterned media
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US09863394 Active 2021-12-02 US6751035B1 (en) 1999-06-08 2001-05-23 Method and system for initializing patterned media
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BELSER, KARL A.;REEL/FRAME:011841/0507