公开(公告)号：SG109018A1

公开(公告)日：2005-02-28

申请号：SG200404686

申请日：2004-07-29

Applicant: IBM

Inventor： NHAN XUAN BUI ,  JAMES HOWARD EATON ,  JUNICHI FUKUDA ,  GLEN ALAN JAQUETTE ,  EIJI OGURA ,  MARK ALLAN TAYLOR ,  KAZUHIRO TSURUTA

IPC: G11B5/008 ,  G11B5/584 ,  G11B5/78

Abstract: In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating characteristic allows identification of the separate servo bands. For example, the patterns of a separate servo band have differing azimuthal orientations of detectable transitions with respect to another servo band, such as being laterally inverted. In another, variations in the width of gaps of patterns are made with respect to another servo band. In another, variations are made in the number of the detectable transitions of patterns with respect to the patterns of another servo band.

公开(公告)号：SG100716A1

公开(公告)日：2003-12-26

申请号：SG200103267

申请日：2001-06-01

Applicant: IBM

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

IPC: G11B5/584 ,  G11B7/09 ,  G11B21/10 ,  G11B5/596

Abstract: A servo system and method position a head laterally with respect to defined servo tracks, employing fine and coarse actuators. A servo control integrates the position error between the head and a desired position in accordance with a predetermined function, and operates the coarse actuator to translate the fine actuator and the head in accordance with the integrated position error. A position error signal loop is coupled to a servo sensor for determining position error for operating the fine actuator to translate the head in a manner to reduce the position error. The position error signal loop may have a compensator function with both integration and other functions. A coarse servo control comprises a connection coupled to the compensator function for providing an integration control representing the integration function of the position error signal loop; and a driver coupled to the connection, operating the coarse actuator to translate the fine actuator and the head in accordance with the integration signal.