公开(公告)号：US06606211B1

公开(公告)日：2003-08-12

申请号：US09556884

申请日：2000-04-19

申请人： Tuang Liang Bernard Lim ,  Myint Ngwe ,  Hwee Peng Teo ,  Fong Kheon Chong

发明人： Tuang Liang Bernard Lim ,  Myint Ngwe ,  Hwee Peng Teo ,  Fong Kheon Chong

IPC分类号： G11B509

CPC分类号： G11B20/1816 ,  G11B5/012 ,  G11B20/1883 ,  G11B20/1889 ,  G11B27/36 ,  G11B2220/20

摘要： Apparatus for detecting defect in a recordable medium such as a disc drive is disclosed. The apparatus includes a recording system which write and read test data on the medium. The apparatus also includes a first comparator for comparing the read data to a first threshold. A first and a second counter, operably connected to the first comparator, are incremented when the read data exceeds the first threshold. When the first counter obtains a first count value, a first defect signal is produced. Data domains associated with the recordable medium are marked as bad in response to the first defect signal. When the second counter obtains a second count value, a second defect signal is produced and data sectors associated with the recordable medium are marked as bad in response to the second defect signal. A method for detecting defects in a recordable medium is also disclosed.

摘要翻译： 公开了一种用于检测诸如盘驱动器的可记录介质中的缺陷的装置。 该装置包括在介质上写入和读取测试数据的记录系统。 该装置还包括用于将读取的数据与第一阈值进行比较的第一比较器。 当读取的数据超过第一阈值时，可操作地连接到第一比较器的第一计数器和第二计数器递增。 当第一计数器获得第一计数值时，产生第一缺陷信号。 与可记录介质相关联的数据域响应于第一缺陷信号被标记为不良。 当第二计数器获得第二计数值时，产生第二缺陷信号，并且响应于第二缺陷信号将与可记录介质相关联的数据扇区标记为不良。 还公开了一种用于检测可记录介质中的缺陷的方法。

公开(公告)号：US06690532B1

公开(公告)日：2004-02-10

申请号：US09539796

申请日：2000-03-31

申请人： Swee Kieong Choo ,  Jack Ming Teng ,  Hwee Peng Teo ,  Myint Ngwe ,  Beng Wee Quak ,  Kwee Teck Say

发明人： Swee Kieong Choo ,  Jack Ming Teng ,  Hwee Peng Teo ,  Myint Ngwe ,  Beng Wee Quak ,  Kwee Teck Say

IPC分类号： G11B2102

CPC分类号： G11B5/012 ,  G11B5/02

摘要： A method and apparatus for detecting and recovering from head instability in a magneto-resistive (MR) transducer head of a disc-drive system. A head-instability-recovery circuit is described for use in disc drive to recover from a head-instability condition of an MR transducer head. This circuit includes a controller and a current source that supplies current to the MR head. The current source is controlled to supply a nominal amount of current to the MR head when operating in a normal mode, and to supply one or more current bursts having a current above the nominal supply current in order to recover from the head-instability condition. Also described is a method for recovering from a transducer-instability condition of an MR transducer of a disc drive, including detecting a situation that indicates a head-instability-recovery operation is desired, and performing the head-instability-recovery operation.

摘要翻译： 一种用于在盘驱动系统的磁阻（MR）换能器头中的头部不稳定性中检测和恢复的方法和装置。 描述磁头不稳定性恢复电路用于磁盘驱动器以从MR换能器头的磁头不稳定状态恢复。 该电路包括向MR磁头供应电流的控制器和电流源。 控制电流源以在正常模式下工作时向MR磁头提供额定电流量，并且提供具有高于额定电源电流的电流的一个或多个电流脉冲串，以便从头部不稳定状态恢复。 还描述了一种用于从盘驱动器的MR换能器的换能器不稳定状态恢复的方法，其包括检测指示头部不稳定性恢复操作期望的情况，以及执行头部不稳定性恢复操作。