公开(公告)号：MY119237A

公开(公告)日：2005-04-30

申请号：MYPI20013743

申请日：2001-08-09

Applicant: IBM

Inventor： BUI NHAN XUAN ,  KOSKI JOHN ALEXANDER ,  SASAKI AKIMITSU ,  TSURUTA KAZUHIRO

IPC: G11B5/584

Abstract: A SERVO SYSTEM AND METHOD POSITION A HEAD LATERALLY WITH RESPECT TO MAGNETIC TAPE LONGITUDINAL DEFINED SERVO BANDS ARRANGED IN A LONGITUDINALLY SHIFTED FOR IDENTIFICATION, AND SEPARATED BY DATA TRACKS. A SERVO CONTROLLER RESPONDS TO A LOSS OF LATERAL POSITION, SENSING AN ESTIMATED LONGITUDINAL POSITION OF THE MAGNETIC TAPE. IF THE ESTIMATED LONGITUDINAL POSITION IS WITHIN A PREDETERMINED DISTANCE OF AN END OF THE TAPE, THE SERVO CONTROLLER OPERATES A DRIVE TO CONTINUOUSLY MOVE THE TAPE AWAY FROM THE SENSED END. THE SERVO CONTROLLER SENSES A HOME LATERAL POSITION SENSOR TO DETERMINE WHETHER A COMPOUND ACTUATOR IS WITHIN A PREDETERMINED DISTANCE OF THE EDGE OF THE MAGNETIC TAPE. IF SO, IT OPERATES THE COARSE ACTUATOR PORTION OF THE COMPOUND ACTUATOR TO MOVE LATERALLY AWAY FROM THE EDGE OF THE MAGNETIC TAPE; ELSE, TO MOVE TOWAED THE EDGE. THE SERVO CONTROLLER SENSES A DUAL SERVO SENSOR TO DETECT ANY TWO OF THE DEFINED SERVO BANDS; AND, UPON SENSING ANY TWO OF THE DEFINED SERVO BANDS, DETECTS THE LONGITUDINAL SHIFT TO IDENTIFY WHICH ONES OF THE TWO DEFINED SERVO BANDS, DETECT THE LONGITUDINAL SHIFT TO IDENTIFY WHICH ONES OF THE TWO DEFINED SERVO BANDS HAVE BEEN DETECTED. @FIG. 4

公开(公告)号：AT245847T

公开(公告)日：2003-08-15

申请号：AT00927599

申请日：2000-05-18

Applicant: IBM

Inventor： BUI NHAN XUAN ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B27/28 ,  G11B27/10 ,  G11B27/32 ,  G11B27/36 ,  G11B15/087

Abstract: A system and method for precisely registering and synchronizing data sets on a recording media having a prerecorded servo pattern. The recording media is subject to continuing movement for reading and/or writing the data sets, interrupted by stopping at the end of a selected data set and restarting. During the continuing movement of the recording media, a detector coupled to the servo system continuously reads linear position registration data modulated into the prerecorded servo pattern. An interpolator interpolates the prerecorded registration data to provide precision registration information for the data sets. Upon the drive stopping the recording media, then back hitching the media and the movement restarting, selected read and interpolated registration information is provided. The detector again reads and interpolates the prerecorded registration data, and a comparator compares the again read and interpolated registration information to the provided read and interpolated registration information and any predetermined offset, and indicates a comparison match. A data formatter coupled to the comparator, responsive to the comparison match indication, synchronizes the reading and/or writing of data sets on the recording media.

公开(公告)号：PL351746A1

公开(公告)日：2003-06-16

申请号：PL35174600

申请日：2000-05-18

Applicant: IBM

Inventor： BUI NHAN XUAN ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B27/28 ,  G11B27/10 ,  G11B27/32 ,  G11B27/36

Abstract: A system and method for precisely registering and synchronizing data sets on a recording media having a prerecorded servo pattern. The recording media is subject to continuing movement for reading and/or writing the data sets, interrupted by stopping at the end of a selected data set and restarting. During the continuing movement of the recording media, a detector coupled to the servo system continuously reads linear position registration data modulated into the prerecorded servo pattern. An interpolator interpolates the prerecorded registration data to provide precision registration information for the data sets. Upon the drive stopping the recording media, then back hitching the media and the movement restarting, selected read and interpolated registration information is provided. The detector again reads and interpolates the prerecorded registration data, and a comparator compares the again read and interpolated registration information to the provided read and interpolated registration information and any predetermined offset, and indicates a comparison match. A data formatter coupled to the comparator, responsive to the comparison match indication, synchronizes the reading and/or writing of data sets on the recording media.

公开(公告)号：DE10123069A1

公开(公告)日：2002-03-14

申请号：DE10123069

申请日：2001-05-11

Applicant: IBM DEUTSCHLAND

Inventor： BUI NHAN XUAN ,  KOSKI JOHN ALEXANDER ,  SASAKI AKIMITSU ,  TSURUTA KAZUHIRO

IPC: G11B5/584 ,  G11B7/09 ,  G11B21/10 ,  G11B5/56

Abstract: The method involves detecting the integration function of a positioning error signal loop, and actuating the coarse actuator so that a fine actuator and a head unit are displaced w.r.t the detected integration function. Independent claims are also included for: (a) a further method for actuating a coarse actuator in a servo system (b) a servo system (c) a data storage system (d) a servo coarse controller

公开(公告)号：CA2413132A1

公开(公告)日：2002-02-21

申请号：CA2413132

申请日：2001-07-06

Applicant: IBM

Inventor： KOSKI JOHN ALEXANDER ,  SASAKI AKIMITSU ,  BUI NHAN XUAN ,  TSURUTA KAZUHIRO

IPC: G11B5/55 ,  G11B5/584 ,  G11B21/08 ,  G11B21/10 ,  G11B5/58

Abstract: A method and position control for a servo system for positioning a head laterally with respect to defined servo tracks. The servo system comprises a servo sensor and detector (115) for sensing lateral position of the head (15 ) and a compound actuator (14) having a fine actuator portion (20) and a coars e actuator portion (16). The position control (116) provides position indications for the coarse actuator portion (16), which may comprise a table relating predetermined nominal lateral position indications to the defined servo tracks. The position control (116) positions the coarse actuator porti on (116) at an estimated position with respect to the defined servo tracks, and responds to the servo sensor to determine which servo track is closest to th e estimated position. The position control (116) sets the coarse actuator portion (16) position indication to the predetermined nominal lateral positi on indication of the closest defined servo track, e.g., by looking it up in the table. This thereby corrects the indication of the position of the coarse actuator portion (16).

公开(公告)号：HK1032657A1

公开(公告)日：2001-07-27

申请号：HK01101506

申请日：2001-03-01

Applicant: IBM

Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAOETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

IPC: G11B5/008 ,  G11B5/584 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  G11B27/13 ,  G11B

Abstract: Disclosed are a method and a detector for adaptively detecting servo gaps in a timing based servo pattern (50) prerecorded on a variable velocity media. The timing based servo pattern has groups of repeated pairs of non-parallel transition stripes arranged in bursts (52,54,55), the bursts separated by servo gaps whose (70-75) length is variable. A servo system sensor (26) senses the transition stripes in the longitudinal direction of the media. A group interval detector coupled to the sensor detects the timing interval between the same slope transition stripes of two sequential groups of bursts (BX,BY). A divider (170) divides the detected group timing interval by a predetermined divisor to provide a divided timing interval gap detection threshold (181). A sequential stripe interval detector coupled to the sensor measures the timing interval between stripes, and a comparator (110) compares the divided timing interval and the timing interval, identifying a servo gap upon the measured timing interval at least equaling the gap threshold. The detector responds to "valid" signals (BXOK,BYOK) which indicate the validity of the detected group timing interval, repeating operation of the divider to update the gap threshold, and repeating operation of the comparator with the updated gap threshold to continue to identify the servo gaps.