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1. 发明授权

US06292912B1 Disk drive having built-in self-test system for characterizing performance of the drive 失效
标题翻译：具有内置自检系统的磁盘驱动器，用于表征驱动器的性能
公开(公告)号：US06292912B1
公开(公告)日：2001-09-18
申请号：US09032220
申请日：1998-02-27
申请人： Robert Leslie Cloke , Patrick James Lee , Howard Anthony Baumer
发明人： Robert Leslie Cloke , Patrick James Lee , Howard Anthony Baumer
IPC分类号： G11C2900
CPC分类号： G11B20/1816 , G06F11/3485
摘要： A disk drive has a normal mode of operation and a built-in self-test (BIST) mode of operation for producing a sequence of channel metrics {&Ggr;n}. The disk drive includes a recording surface having a plurality of bit cells and a transducer for reading the plurality of bit cells to produce a noise-corrupted read signal. The disk drive further includes means responsive to the noise-corrupted read signal for generating a sequence of observed samples {yn}, the sequence of observed samples {yn} forming a sequence of observed-sample subsequences {Yn}. An expected sample generator operates during the BIST mode of operation to provide a sequence of expected samples {wn}, the sequence of expected samples forming a sequence of expected-sample subsequences {Wn}. A channel metrics &Ggr;n computation system computes a sequence of channel metrics {&Ggr;n}. Each channel metric &Ggr;n is a function of a distance determined from one of the observed-sample subsequences Yn to the corresponding expected-sample subsequence Wn. Each channel metric &Ggr;n is independent of the earliest observed sample in every prior observed-sample subsequence Yn and the earliest expected sample in every prior expected-sample subsequence Wn.
摘要翻译：磁盘驱动器具有正常的操作模式和内置的自检（BIST）操作模式，用于产生一系列信道度量{＆Ggr; n}。磁盘驱动器包括具有多个位单元的记录表面和用于读取多个位单元以产生噪声损坏的读取信号的换能器。磁盘驱动器还包括响应于噪声损坏的读取信号的装置，用于产生观察到的样本序列{yn}，观察样本序列{yn}形成观察样本子序列{Yn}的序列。期望的样本发生器在BIST操作模式期间操作以提供预期样本序列（wn}，预期样本的序列形成预期样本子序列{Wn}的序列。信道度量＆Ggrn计算系统计算信道度量序列{＆Ggr; n}。每个信道度量＆Ggr; n是从观测样本子序列Yn到相应的预期样本子序列Wn确定的距离的函数。每个通道度量＆Ggr; n独立于每个先前观察样品子序列Yn中最早观察到的样本，以及每个先前预期样本子序列Wn中最早的预期样本。

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