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    • 8. 发明申请
    • SYSTEM AND METHOD FOR TERMINAL SHORT DETECTION
    • 用于终端短路检测的系统和方法
    • WO01095326A3
    • 2002-03-28
    • PCT/US2001/018207
    • 2001-06-06
    • G01R31/02G11B5/455G11B19/04
    • G11B5/022G01R31/025G11B5/455
    • Shorts are detected in terminals fed current by a driver connected to the terminals. To detect terminal-to-ground shorts, at least one virtual driver is connected to the driver for processing an output of the driver, and a detector detects if a short has occurred, based on an output of the virtual driver, by detecting when an output of the virtual driver exceeds a first threshold. If the detector detects that the output of the virtual driver has exceeded the first threshold, this indicates a terminal-to-ground short. To detect terminal-to-terminals shorts, a detector detects when an output of the driver drops below a second threshold. If the detector detects that the output of the driver has dropped below the second threshold, this indicates a terminal-to-terminal short. Shorts may be detected in terminals in one or more write heads. The driver, virtual driver, and detector may be included in a preamplifier. Detecting shorts in this manner avoids the loss of data without impeding performance of the write driver.
    • 在通过连接到终端的驱动器馈送电流的端子中检测到短裤。 为了检测终端对地短路,至少一个虚拟驱动器连接到驱动器以处理驱动器的输出,并且检测器基于虚拟驱动器的输出检测是否发生了短路,通过检测何时 虚拟驱动器的输出超过第一阈值。 如果检测器检测到虚拟驱动器的输出已超过第一个阈值,则表示终端对地短路。 为了检测终端到终端短路,检测器检测驾驶员的输出何时下降到低于第二阈值。 如果检测器检测到驱动器的输出已经降到第二阈值以下,则表示终端到终端短路。 可以在一个或多个写入头中的终端中检测到短裤。 驱动器,虚拟驱动器和检测器可以包括在前置放大器中。 以这种方式检测短路可避免数据丢失,而不会妨碍写入驱动程序的性能。
    • 9. 发明申请
    • METHOD AND APPARATUS FOR TESTING MAGNETIC HEAD ELEMENTS
    • 用于测试磁头元件的方法和装置
    • WO01004655A1
    • 2001-01-18
    • PCT/US2000/019286
    • 2000-07-14
    • G01R35/00G11B5/455G01R33/00
    • G11B5/455
    • The present invention includes a method and apparatus that will permit the identification of damaged magnetic head elements. One aspect of this invention includes an electromagnetic structure (10) having a core (12), a plurality of electrical windings (14), and an air gap (13) adapted to receive a head stack assembly. The coils may be connected to a power source (16) and series resonant driver (22). Some embodiments of the present invention may further comprise a controller (20) operably connected to the series resonant driver and adapted to compensate for a variation in a magnetic field strength across the air gap. Another aspect of the present invention involves a method of testing a magnetic head element. One embodiment of this method includes the steps of measuring the head's output in response to an externally applied magnetic field, Fourier transforming the output signal, and using the resulting power levels to calculate a value indicative of a distortion in the head's output.
    • 本发明包括一种允许识别损坏的磁头元件的方法和装置。 本发明的一个方面包括具有芯(12),多个电绕组(14)和适于容纳磁头叠层组件的气隙(13)的电磁结构(10)。 线圈可以连接到电源(16)和串联谐振驱动器(22)。 本发明的一些实施例还可以包括可操作地连接到串联谐振驱动器并且适于补偿穿过气隙的磁场强度的变化的控制器(20)。 本发明的另一方面涉及一种测试磁头元件的方法。 该方法的一个实施例包括以下步骤:响应于外部施加的磁场测量磁头的输出,傅里叶变换输出信号,并且使用所得到的功率电平来计算指示磁头输出中的失真的值。
    • 10. 发明申请
    • REDUCED HEAD POPULATION DETECTION IN A DISC DRIVE
    • 磁盘驱动器中减少的头部人口检测
    • WO00002192A1
    • 2000-01-13
    • PCT/US1999/015088
    • 1999-07-01
    • G11B21/02G11B5/012G11B5/39G11B5/455G11B5/48G11B19/02G11B21/00
    • G11B5/012G11B5/39G11B5/455G11B5/4886G11B19/02G11B21/00
    • An apparatus and method for determining the configuration of a disc drive (100) head-disc assembly (HDA) (101). The HDA includes an array of rotatable discs (106) and an actuator assembly (110) adjacent the discs, with the actuator assembly supporting a maximum number of heads (120) in a fully populated configuration and a reduced number of heads in a depopulated configuration. Each head is disposed at a unique head position. During each spin-up of the disc drive, a servo circuit (148) determines an impedance of a selected head position having a head when the disc drive is fully populated, but not when the disc drive is depopulated. The servo circuit identifies the configuration of the HDA in relation to the determined impedance, and initializes the drive accordingly.
    • 一种用于确定盘驱动器(100)头盘组件(HDA)(101)的配置的装置和方法。 HDA包括可旋转盘(106)的阵列和与盘相邻的致动器组件(110),其中致动器组件以完全填充的构型支撑最大数目的头部(120),并且减少数量的头部的人口配置 。 每个头部处于独特的头部位置。 在磁盘驱动器的每次启动期间,伺服电路(148)确定当磁盘驱动器完全填充时具有磁头的所选磁头位置的阻抗,而不是在磁盘驱动器被人口填充时的阻抗。 伺服电路相对于确定的阻抗识别HDA的配置,并相应地初始化驱动器。