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公开(公告)号：CA2365155C
公开(公告)日：2002-08-20
申请号：CA2365155
申请日：1995-11-24
Applicant: IBM
Abstract: A mechanism for servowriting on a storage medium of a storage device. The storage device has a transducer and a servo loop for positioning the transducer with respec t to the storage medium. At least one transition is written on a track of the storage medium, while servoing on other transitions previously recorded on the storage medium. A reference waveform is derived as a function of a closed loop response of the servo loop and a position error waveform. The position error waveform corresponds to one or more position errors of the transducer relative to the previously recorded transitions. The reference waveform is usable in writing subsequent tracks on the storage medium. Using the reference waveform for writing subsequent trac ks provides a substantial rejection of mechanical disturbances by the servo loop.
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公开(公告)号：CA2366415C
公开(公告)日：2002-07-16
申请号：CA2366415
申请日：1995-11-24
Applicant: IBM
Abstract: During a write revolution of a storage medium, a transition is written on th e storage medium while servoing on another transition previously recorded on the storage medium. During that write revolution, a position error signal corresponding to the position error of t he transducer relative to the previously recorded transition is determined. That position error signal is then stored, during the write revolution, to be used in computing a reference track value associated with the transition being written to correct for the position error. Additionally, a product servo- pattern is written, which includes an embodying of the position error therein.
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公开(公告)号：CA2365103C
公开(公告)日：2002-07-16
申请号：CA2365103
申请日：1995-11-24
Applicant: IBM
Abstract: During a write revolution of a storage medium, a transition is written on th e storage medium while servoing on another transition previously recorded on the storage medium. During that write revolution, a position error signal corresponding to the position error of t he transducer relative to the previously recorded transition is determined. That position error signal is then stored, during the write revolution, to be used in computing a reference track value associated with the transition being written to correct for the position error. Additionally, a product servo- pattern is written, which includes an embodying of the position error therein.
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公开(公告)号：SG52937A1
公开(公告)日：1998-09-28
申请号：SG1997000894
申请日：1997-03-22
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: Methods and systems for self-servowriting a data storage medium are disclosed, including servoing to propagation bursts of a propagation pattern located in tracks other than an immediately preceding track. Reference levels used to position a recording head are accordingly kept in a usable dynamic range necessary to keep servo track spacing constant across the medium. The methods and systems are disclosed in connection with a rotary actuator having spaced read and write heads. Similar methods are disclosed for writing trigger or timing bursts of the propagation pattern.
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公开(公告)号：SG50848A1
公开(公告)日：1998-07-20
申请号：SG1997002060
申请日：1997-06-14
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: An accurate and time-efficient method and system for self-servowriting wherein at least one reference value used to position the transducer is updated for some, but not all, of the tracks to be written. The reference value(s) is dependent upon a predefined indicium of transducer position, such as the amplitude of the readback signal obtained from a written track when the transducer is positioned on the track. In a first embodiment, updating of the reference value(s) is performed at every Nth track written, where N is a fixed number or range of numbers determined by an expected track-to-track variation of the indicium. The servowriting system may be designed to dynamically increase or decrease N during servowriting in response to actual variations in the indicium. According to a second embodiment, updating is only performed when needed, e.g. when the variation of the measured indicium between two written tracks (not necessarily adjacent tracks) exceeds a predefined threshold value. For systems employing dual-element heads, servowriting accuracy is enhanced by performing a read head adjustment prior to updating of the reference values.
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Patent Agency Ranking
公开(公告)号：CA2163689A1
公开(公告)日：1996-06-03
申请号：CA2163689
申请日：1995-11-24
Applicant: IBM
Abstract: A mechanism for servowriting on a storage medium of a storage device. The storage device has a transducer and a servo loop for positioning the transducer with respect to the storage medium. At least one transition is written on a track of the storage medium, while servoing o n other transitions previously recorded on the storage medium. A reference waveform is derived as a functio n of a closed loop response of the servo loop and a position error waveform. The position error waveform corresponds to one or more position errors of the transducer relative to the previously recorded transitions. The reference waveform is usable in writing subsequent tracks on the storage medium. Using the reference waveform for writing subsequent tracks provides a substantial rejection of mechanical disturbance s by the servo loop.
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公开(公告)号：MY128973A
公开(公告)日：2007-03-30
申请号：MYPI9702018
申请日：1997-05-07
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: METHODS AND SYSTEMS FOR SELF-SERVOWRITING A DATA STORAGE MEDIUM ARE DISCLOSED, INCLUDING SERVOING TO PROPAGATION BURSTS OF A PROPAGATION PATTERN LOCATED IN TRACKS OTHER THAN AN IMMEDIATELY PRECEDING TRACK. REFERENCE LEVELS USED TO POSITION A RECORDING HEAD ARE ACCORDINGLY KEPT IN A USABLE DYNAMIC RANGE NECESSARY TO KEEP SERVO TRACK SPACING CONSTANT ACROSS THE MEDIUM. THE METHODS AND SYSTEMS ARE DISCLOSED IN CONNECTION WITH A ROTARY ACTUATOR HAVING SPACED READ AND WRITE HEADS. SIMILAR METHODS ARE DISCLOSED FOR WRITTING TRIGGER OR TIMING BURSTS OF THE PROPAGATION PATTERN.(FIG 4)
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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：SG52990A1
公开(公告)日：1998-09-28
申请号：SG1997002063
申请日：1997-06-14
Applicant: IBM
Inventor： CHAINER TIMOTHY JOSEPH , SCHULTZ MARK DELORMAN , WEBB BUCKNELL CHAPMAN , YARMCHUK EDWARD JOHN
Abstract: An improved servowriting system and method whereby errors introduced into the written servo information are reduced or eliminated for greater servowriting accuracy. Accuracy is enhanced by one or more of the following improvements: 1) optimizing write current and write frequency to minimize write width modulation; 2) optimizing the RPM of the storage medium to minimize random mechanical vibration; and 3) providing a clip level check to eliminate the introduction of large errors in product servopattern. The proposed improvements provide substantial rejection of, for example, mechanical and magnetic disturbances, ensuring a robust servowriting process.
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