公开(公告)号：US09959052B1

公开(公告)日：2018-05-01

申请号：US14857467

申请日：2015-09-17

Applicant: Western Digital Technologies, Inc.

Inventor： Jun Xu ,  Wei Xi ,  Guoxiao Guo ,  Jianyi Wang ,  Junpeng Niu

IPC: G06F12/00 ,  G06F3/06 ,  G06F12/0871 ,  G06F12/0815

CPC classification number: G06F3/061 ,  G06F3/0644 ,  G06F3/0656 ,  G06F3/0676 ,  G06F12/0815 ,  G06F12/0871

Abstract: Write commands are received for a Data Storage Device (DSD) to store write data in a plurality of corresponding write locations on at least one disk of the DSD. At least a portion of the write data is cached in at least one Media Based Cache (MBC) region of the at least one disk based on a write cache policy for determining which write data is eligible for caching in the at least one MBC region. The at least one MBC region is used to cache data to be stored in other locations on the at least one disk. During an active time period when host commands are performed on the at least one disk, a portion of an I/O bandwidth for performing commands is used to copy the at least a portion of the write data to corresponding write locations of the plurality of corresponding write locations.

公开(公告)号：US09343094B1

公开(公告)日：2016-05-17

申请号：US14669724

申请日：2015-03-26

Applicant: Western Digital Technologies, Inc.

Inventor： Kun Ma ,  Jianyi Wang ,  Hui Li ,  Wai Ee Wong ,  Guoxiao Guo

IPC: G11B5/596

CPC classification number: G11B5/59627 ,  G11B5/59622 ,  G11B5/59688

Abstract: A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo bursts. A number of burst correction values are generated by reading at least one of the servo bursts at a number of different radial locations across the disk. The burst correction values are filtered to generate filtered burst correction values, and the filtered burst correction values are downsampled to generate downsampled burst correction values. The downsampled burst correction values are written to the disk, and the head is servoed over the disk by reading the downsampled burst correction values from the disk.

Abstract translation: 公开了一种数据存储装置，其包括在盘上致动的磁头，该磁头包括由伺服脉冲串定义的多个伺服磁道。 通过读取跨越盘的多个不同径向位置处的多个伺服脉冲串中的至少一个来产生多个突发校正值。 对脉冲串校正值进行滤波以产生滤波的脉冲串校正值，并对经滤波的脉冲串校正值进行下采样以产生下采样的脉冲串校正值。 将下采样的突发校正值写入盘，并且通过从盘读取下采样的突发校正值来将磁头伺服在磁盘上。