公开(公告)号：US08856615B1

公开(公告)日：2014-10-07

申请号：US13493856

申请日：2012-06-11

申请人： Anantha Raman Krishnan ,  Shayan S. Garani ,  Kent D. Anderson ,  Shafa Dahandeh

发明人： Anantha Raman Krishnan ,  Shayan S. Garani ,  Kent D. Anderson ,  Shafa Dahandeh

IPC分类号： G11C29/42 ,  H03M13/29 ,  G11C29/54 ,  G06F11/10

CPC分类号： G06F11/1076 ,  G06F11/1008 ,  G06F11/1012 ,  G11C29/52 ,  G11C2029/0409 ,  G11C2029/0411 ,  H03M13/2957 ,  H03M13/45 ,  H03M13/6325

摘要： A data storage device is disclosed comprising a non-volatile memory (NVM). First data is written to a first area of the NVM, and a first estimated data sequence is read from the first area of the NVM. The first estimated data sequence is first decoded, and a log-likelihood ratio (LLR) is first updated based on the first decode. Second data is written to a second area of the NVM, and a second estimated data sequence is read from the second area of the non-volatile memory. The second estimated data sequence is second decoded in response to the first updated LLR, and the LLR is second updated based on the second decode.

摘要翻译： 公开了一种包括非易失性存储器（NVM）的数据存储设备。 第一数据被写入NVM的第一区域，并且从NVM的第一区域读取第一估计数据序列。 首先对第一估计数据序列进行解码，并且首先根据第一解码更新对数似然比（LLR）。 第二数据被写入NVM的第二区域，并且从非易失性存储器的第二区域读取第二估计数据序列。 响应于第一更新的LLR对第二估计数据序列进行第二解码，并且基于第二解码对LLR进行第二次更新。

公开(公告)号：US08773802B1

公开(公告)日：2014-07-08

申请号：US13157809

申请日：2011-06-10

申请人： Kent D. Anderson ,  Shafa Dahandeh ,  Galvin T. Chia ,  Alvin W. Tan ,  Noureddine Kermiche ,  Ming Jin

发明人： Kent D. Anderson ,  Shafa Dahandeh ,  Galvin T. Chia ,  Alvin W. Tan ,  Noureddine Kermiche ,  Ming Jin

IPC分类号： G11B5/60

CPC分类号： G11B5/6076 ,  G11B5/6029

摘要： A disk drive is disclosed comprising a head actuated over a disk and a fly height actuator operable to control a fly height of the head in response to a fly height control signal. A touchdown operation is executed to set an operating fly height control signal by adjusting the fly height control signal until the head contacts the disk. A fly height calibration track is then read to set a fly height reference. When calibrating the operating fly height control signal, the fly height calibration track is read and the operating fly height control signal is adjusted in response to the fly height reference. When the adjusted operating fly height control signal is invalid, the touchdown operation is re-executed to reset the operating fly height control signal and then the fly height calibration track is read to reset the fly height reference.

摘要翻译： 公开了一种磁盘驱动器，其包括在磁盘上致动的磁头和可高速运行的飞行高度致动器，用于响应于飞行高度控制信号来控制磁头的飞行高度。 执行触地操作以通过调整飞行高度控制信号直到磁头与磁盘接触来设定操作飞行高度控制信号。 然后读取飞行高度校准轨道以设置飞行高度参考。 当校准操作飞行高度控制信号时，读取飞行高度校准轨迹，并且响应于飞行高度参考来调整操作飞行高度控制信号。 当调整后的操作飞行高度控制信号无效时，重新执行触地操作以复位操作飞行高度控制信号，然后读取飞行高度校准轨道以重置飞行高度参考。

公开(公告)号：US06249393B1

公开(公告)日：2001-06-19

申请号：US09098319

申请日：1998-06-16

申请人： Russell A. Billings ,  Shafa Dahandeh ,  Mark D. Hagen

发明人： Russell A. Billings ,  Shafa Dahandeh ,  Mark D. Hagen

IPC分类号： G11B2736

CPC分类号： G11B19/04 ,  G11B5/012 ,  G11B5/6029 ,  G11B20/10009 ,  G11B27/36 ,  G11B2220/20

摘要： A disk drive with a write condition detector generates a write condition signal from a reference signal to warn of a high fly write or a low fly write. The reference signal is generated by the disk drive read/write head by reading a reference segment. The write condition detector processes fly-height varying components from the reference signal. The write condition detector generates a write condition signal, responsive to the fly-height varying components and the threshold, that indicates that the writing of data in a user data segment during the write operation is unsafe when the head deviates from its operating flying-height. The threshold is computed using zone coefficients determined during an intelligent burn in of the disk drive, and is based on a nominal fly height. The write condition signal is processed by a microprocessor that instructs a disk controller to deactivate a write gate controlling the write operation. The disk drive then implements verification, diagnostics and recovery steps to complete the write operation.

摘要翻译： 具有写入条件检测器的磁盘驱动器从参考信号产生写入条件信号，以警告高速写入或低速写入。 参考信号由磁盘驱动器读/写头通过读取参考段产生。 写状态检测器根据参考信号处理飞高变化的分量。 写条件检测器响应于飞高变化分量和阈值产生写入条件信号，其指示当写入操作期间在头部偏离其操作飞行高度时写入用户数据段中的数据是不安全的 。 使用在磁盘驱动器的智能刻录期间确定的区域系数来计算阈值，并且基于标称飞行高度。 写入状态信号由微处理器处理，微处理器指示磁盘控制器停止控制写入操作的写入门。 然后，磁盘驱动器实现验证，诊断和恢复步骤来完成写入操作。