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公开(公告)号：JPH08212527A
公开(公告)日：1996-08-20
申请号：JP30777795
申请日：1995-11-27
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: PROBLEM TO BE SOLVED: To minimize the influence of a speed jitter without reducing the interval by calculating the isolation of reading and writing elements based on the difference of first and second delay times and the rotating speed of a disk. SOLUTION: The system of a self-servo writing unit has an electronic block including a radial propagation controller 2, a timing propagating controller 4 and a pattern generator 6. The method for deciding the isolation between reading and writing elements of a head in this unit is decided by the following steps. The first step positions the head in the first radius of a disk to decide the first reading and writing time delay. The second step positions the head in the second radius of the disk to decide the second reading and writing element delay. Further, the third step calculates the isolation of the reading and writing elements based on the difference of the first and second delays and rotating speed of the disk. Thus, suitable positioning is conducted.
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2.发明专利
公开(公告)号：JP2001243734A
公开(公告)日：2001-09-07
申请号：JP2001023388
申请日：2001-01-31
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: PROBLEM TO BE SOLVED: To provide an improvement of pattern arrangement when servo information is written by the head of its own by correcting random errors and systematic errors due to the shape influence of the head, generated at a time when trigger patterns are written on a disk. SOLUTION: This method for deciding the value of the systematic error in the case of generating the trigger patterns on a rotating disk, has a step ion which a 1st time interval T146 between 1st and 2nd trigger patterns written by the head positioned at a 1st radial position ST#1 on the disk is measured, a step in which a 2nd time interval T145 between a 3rd trigger pattern written by the head positioned at a 2nd radial position ST#2 on the disk and the 2nd trigger pattern, and a step in which the 1st time interval is compared with the 2nd time interval to decide the value of the systematic error. As a result, it is possible to prevent the propagation of an error of a pattern position.
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公开(公告)号：CA2163053A1
公开(公告)日：1996-06-02
申请号：CA2163053
申请日：1995-11-16
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Improvements in placement of timing patterns in self servo writing include c orrecting for random and systematic errors due to geometric effects. In a disk drive h aving a recording head with separate read and write elements, a method for determini ng separation between the elements and for correcting for such errors as a func tion of skew angle between the head and the disk. Errors resulting from misalignment andnon-parallelism of the elements as well as misalignm ent of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocit y of the disk and misplacement of timing patterns with respect to adjacent timing patterns aredetected and corrected. In general, a single revolut ion process may be used to both write and detect random errors on each track and corrected on subsequent tra cks.
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Patent Agency Ranking
公开(公告)号：SG67406A1
公开(公告)日：1999-09-21
申请号：SG1997002591
申请日：1995-11-10
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.
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公开(公告)号：DE69525323T2
公开(公告)日：2002-10-02
申请号：DE69525323
申请日：1995-11-03
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.
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公开(公告)号：SG71034A1
公开(公告)日：2000-03-21
申请号：SG1997002589
申请日：1995-11-10
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.
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公开(公告)号：DE69525323D1
公开(公告)日：2002-03-21
申请号：DE69525323
申请日：1995-11-03
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.
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公开(公告)号：SG34300A1
公开(公告)日：1996-12-06
申请号：SG1995001806
申请日：1995-11-10
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , PRAINO ANTHONY PAUL , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.
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