公开(公告)号：DE60105436T2

公开(公告)日：2005-10-06

申请号：DE60105436

申请日：2001-07-06

Applicant: IBM

Inventor： BUI XUAN ,  KOSKI ALEXANDER ,  SASAKI AKIMITSU ,  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 for sensing lateral position of the head and a compound actuator having a fine actuator portion and a coarse actuator portion. The position control provides position indications for the coarse actuator portion, which may comprise a table relating predetermined nominal lateral position indications to the defined servo tracks. The position control positions the coarse actuator portion 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 the estimated position. The position control sets the coarse actuator portion position indication to the predetermined nominal lateral position 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.

公开(公告)号：DE60105437D1

公开(公告)日：2004-10-14

申请号：DE60105437

申请日：2001-07-06

Applicant: IBM

Inventor： BUI XUAN ,  KOSKI 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 pattern 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 toward 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 have been detected.

公开(公告)号：DE60105436D1

公开(公告)日：2004-10-14

申请号：DE60105436

申请日：2001-07-06

Applicant: IBM

Inventor： BUI XUAN ,  KOSKI ALEXANDER ,  SASAKI AKIMITSU ,  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 for sensing lateral position of the head and a compound actuator having a fine actuator portion and a coarse actuator portion. The position control provides position indications for the coarse actuator portion, which may comprise a table relating predetermined nominal lateral position indications to the defined servo tracks. The position control positions the coarse actuator portion 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 the estimated position. The position control sets the coarse actuator portion position indication to the predetermined nominal lateral position 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.

公开(公告)号：DE60105437T2

公开(公告)日：2005-09-22

申请号：DE60105437

申请日：2001-07-06

Applicant: IBM

Inventor： BUI XUAN ,  KOSKI 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 pattern 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 toward 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 have been detected.

公开(公告)号：DE60004043T2

公开(公告)日：2004-04-15

申请号：DE60004043

申请日：2000-05-18

Applicant: IBM

Inventor： BUI XUAN ,  JAQUETTE ALAN ,  KOSKI 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：DE60004043D1

公开(公告)日：2003-08-28

申请号：DE60004043

申请日：2000-05-18

Applicant: IBM

Inventor： BUI XUAN ,  JAQUETTE ALAN ,  KOSKI 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.