NARROW BAND DWELL MONITORING
    12.
    发明申请

    公开(公告)号:US20180336921A1

    公开(公告)日:2018-11-22

    申请号:US15971158

    申请日:2018-05-04

    CPC classification number: G11B5/2655 G11B5/455 G11B5/725

    Abstract: Narrow band dwell occurs when air bearings corresponding to a set of read and/or write heads within a hard disc drive remain within a fixed narrow band of one or more storage platters for an extended period of time. The air bearings displace lubricant on the storage platters and may redeposit the lubricant as droplets on the platters. The presently disclosure technology is directed to monitoring a hard disc drive for narrow band dwell, and in some implementations, implementing operations to mitigate narrow band dwell. More specifically, the presently disclosure technology may detect an overflying air-bearing slider position, apply a lubrication film displacement formula to a narrow band of the storage platter, apply a lubrication film reflow formula to one or more other narrow bands of the storage platter, and track lubrication film thickness over time in each of the narrow bands of the storage platter.

    Head-medium contact detection using introduced heat oscillation
    13.
    发明授权
    Head-medium contact detection using introduced heat oscillation 有权
    使用引入热振荡的头 - 介质接触检测

    公开(公告)号:US08638349B1

    公开(公告)日:2014-01-28

    申请号:US13793803

    申请日:2013-03-11

    CPC classification number: G11B5/581 G11B5/607 G11B5/6076

    Abstract: An apparatus includes a head transducer configured to interact with a magnetic recording medium and a heater configured to thermally actuate the head transducer. A thermal sensor at or near the head transducer is configured to produce a sensor signal. Circuitry is coupled to the heater and configured to cause an oscillation in heater power. The heater power oscillation causes an oscillation in the sensor signal. A detector is coupled to the thermal sensor and configured to detect head-medium contact using the oscillating sensor signal and heater power.

    Abstract translation: 一种装置包括:头部换能器,被配置为与磁记录介质相互作用;以及加热器,其被配置为热致动头部换能器。 在头部传感器处或附近的热传感器被配置成产生传感器信号。 电路耦合到加热器并且被配置为引起加热器功率的振荡。 加热器功率振荡导致传感器信号的振荡。 检测器耦合到热传感器并且被配置为使用振荡传感器信号和加热器功率检测头 - 介质接触。

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