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    Individual MR transducer head/disk/channel adaptive bias current system
    1.
    发明公开
    Individual MR transducer head/disk/channel adaptive bias current system 失效
    适应Vormagnetisierung系统个人 - MR-Wandlerkopf / -Platte / -Kanal。

    公开(公告)号：EP0658879A3

    公开(公告)日：1995-11-02

    申请号：EP94480137.2

    申请日：1994-11-15

    申请人： International Business Machines Corporation

    发明人： Christner, Jodie Ann ,  Cunningham, Earl A. ,  Kerwin, Gregory John ,  Poss, Joe Martin

    IPC分类号： G11B5/035 ,  G11B5/02 ,  G11B5/012 ,  G11B19/02

    CPC分类号： G11B19/02 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B5/465 ,  G11B2005/0008 ,  G11B2005/0018

    摘要： A method and apparatus is disclosed for adaptively controlling the biasing current applied to magnetoresistive (MR) read heads (10a,10b,10c,10d) within a magnetic disk drive to provide optimized bias for each head/disk/channel component combination. An optimized bias current for each head is ascertained and stored on the disk surface at the time of manufacture. During each power up operation the values are transferred to random access memory which is accessed during the execution of each head switch command to apply bias current in accordance with the optimized value to the active MR head. Periodic reoptimization and updating of the stored values is effected by general error measurement circuitry (GEM) that forms a part of the device control system and is invoked to perform the reoptimization upon the occurrence of an event such as a predetermined duration of power on operation subsequent to the last reoptimization procedure.

    摘要翻译： 在具有记录在介质表面上的轨道中并且包括至少一个磁阻（MR）换能器读头的数据的磁数据存储装置中，用于读头偏置电流的自适应控制方法包括确定每个MR磁头的优化偏置电流值。 存储优化的值，并且根据存储的值向有源MR头提供偏置电流。 为每个MR磁头周期性地重新确定优化的偏置电流值，并修改存储的偏置电流值以对应于新的优化偏置电流值。 偏置电流值存储在磁盘介质表面上，并在设备的上电顺序期间从磁盘存储器传输到随机存取存储器。

    Individual MR transducer head/disk/channel adaptive bias current system
    2.
    发明公开
    Individual MR transducer head/disk/channel adaptive bias current system 失效
    独立的MR传感器磁头/磁盘/通道自适应偏置电流系统

    公开(公告)号：EP0658879A2

    公开(公告)日：1995-06-21

    申请号：EP94480137.2

    申请日：1994-11-15

    申请人： International Business Machines Corporation

    发明人： Christner, Jodie Ann ,  Cunningham, Earl A. ,  Kerwin, Gregory John ,  Poss, Joe Martin

    IPC分类号： G11B5/035 ,  G11B5/02 ,  G11B5/012 ,  G11B19/02

    CPC分类号： G11B19/02 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B5/465 ,  G11B2005/0008 ,  G11B2005/0018

    摘要： A method and apparatus is disclosed for adaptively controlling the biasing current applied to magnetoresistive (MR) read heads (10a,10b,10c,10d) within a magnetic disk drive to provide optimized bias for each head/disk/channel component combination. An optimized bias current for each head is ascertained and stored on the disk surface at the time of manufacture. During each power up operation the values are transferred to random access memory which is accessed during the execution of each head switch command to apply bias current in accordance with the optimized value to the active MR head. Periodic reoptimization and updating of the stored values is effected by general error measurement circuitry (GEM) that forms a part of the device control system and is invoked to perform the reoptimization upon the occurrence of an event such as a predetermined duration of power on operation subsequent to the last reoptimization procedure.

    摘要翻译： 公开了一种用于自适应地控制施加到磁盘驱动器内的磁阻（MR）读取头（10a，10b，10c，10d）的偏置电流以为每个磁头/盘/通道组件组合提供最佳偏置的方法和设备。 确定每个磁头的最佳偏置电流并在制造时存储在磁盘表面上。 在每次上电操作期间，将值传送到随机存取存储器，随机存取存储器在执行每个磁头开关命令期间被访问，以根据优化值将偏置电流施加到有效MR磁头。 通过形成设备控制系统的一部分的一般误差测量电路（GEM）来实现所存储值的周期性重新优化和更新，并且被调用以在事件发生时执行重新优化，例如预定的电源接通操作持续时间 到最后的重新优化程序。