发明申请
- 专利标题: TRACK FOLLOWING SERVO ACTUATOR OFFSET CALIBRATION FOR TAPE DRIVE
- 专利标题(中): 跟踪驱动器的伺服驱动器偏移校准
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申请号: US11351774申请日: 2006-02-10
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公开(公告)号: US20070188910A1公开(公告)日: 2007-08-16
- 发明人: Nhan Bui , Ernest Gale , Eiji Ogura , Kazuhiro Tsuruta
- 申请人: Nhan Bui , Ernest Gale , Eiji Ogura , Kazuhiro Tsuruta
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 主分类号: G11B5/584
- IPC分类号: G11B5/584 ; G11B5/55
摘要:
A magnetic tape drive, having a compound servo actuator, reduces the possibility of overshoots of servo elements when a tape cartridge is loaded, thereby reducing servo failures. The coarse motor is activated, then deactivated when the servo elements locate a servo pattern on the tape. After initialization of a DAC offset in the servo controller to 0, the position of the fine actuator is read. The fine actuator is enabled, with a DAC input of 0 and, after a short wait, the position is again read. The new DAC offset equals the initial DAC offset plus the difference between the two positions. If the difference is less than a predetermined threshold, the servo controller may obtain a lock on the servo signals and commence tracking. If the difference is not less, the process is repeated, with the DAC offset being adjusted each time, until the difference is less than a predetermined threshold.
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