公开(公告)号：US09842617B1

公开(公告)日：2017-12-12

申请号：US14754340

申请日：2015-06-29

申请人： Western Digital Technologies, Inc.

发明人： Phillip Scott Haralson ,  Galvin T. P. Chia ,  Steven R. Vasquez ,  Mark McDaniel

IPC分类号： G11B5/02 ,  G11B15/12 ,  G11B19/02 ,  G11B5/60 ,  G11B5/00

CPC分类号： G11B5/6029 ,  G11B5/6011 ,  G11B2005/0021

摘要： An apparatus includes: a media; a heat assisted magnetic recording (HAMR) head over the media; and control circuitry, coupled to the HAMR head, the control circuitry being configured to: receive a write command to write the media; apply a dynamic flying height (DFH) control before asserting a write gate of the HAMR head; assert the write gate to the HAMR head; and enable a flying height compensation mechanism to maintain a constant value of a flying height of the HAMR head over the media during a next assertion of the write gate.

公开(公告)号：US08908311B1

公开(公告)日：2014-12-09

申请号：US14173895

申请日：2014-02-06

申请人： Western Digital Technologies, Inc.

发明人： Steven R. Vasquez

IPC分类号： G11B19/04 ,  G11B20/12

CPC分类号： G11B20/1217 ,  G11B2020/1232

摘要： A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of data sectors. During a first revolution of the disk, write data is first encoded into a codeword spanning at least a first data sector and a second data sector and a first part of the codeword is written to the first data sector. During a second revolution of the disk, the write data is second encoded into the codeword and a second part of the codeword is written to the second data sector.

摘要翻译： 公开了一种数据存储装置，包括在包括多个数据扇区的盘上启动的磁头。 在盘的第一次旋转期间，写数据首先被编码成跨越至少第一数据扇区和第二数据扇区的码字，并且将码字的第一部分写入第一数据扇区。 在盘的第二次旋转期间，写数据被第二编码成码字，并且码字的第二部分被写入第二数据扇区。

公开(公告)号：US09836232B1

公开(公告)日：2017-12-05

申请号：US14870571

申请日：2015-09-30

申请人： Western Digital Technologies, Inc.

发明人： Steven R. Vasquez ,  James N. Malina

IPC分类号： G06F3/06 ,  G06F12/08 ,  G06F12/0868

CPC分类号： G06F3/0656 ,  G06F3/0613 ,  G06F3/0644 ,  G06F3/068 ,  G06F3/0685 ,  G06F11/14 ,  G06F12/0804 ,  G06F12/0868 ,  G06F12/0897 ,  G06F2212/1016 ,  G06F2212/1032 ,  G06F2212/225 ,  G06F2212/461 ,  G06F2212/466

摘要： A data storage device is disclosed comprising a volatile memory, a primary and a first secondary non-volatile memory (NVM), and control circuitry coupled to the volatile memory and the primary and first secondary NVM and configured to (a) write metadata and user data associated with a host write command to the volatile memory; (b) write the user data to the primary NVM; (c) continue to write metadata associated with each of one or more host write commands to the volatile memory, and when a first condition is met, write metadata that has accumulated in the volatile memory to the first secondary NVM; and (d) repeat (c), and when a second condition is met, then write at least a portion of the metadata that has accumulated in the first secondary NVM or the volatile memory to the primary NVM.

公开(公告)号：US09001449B1

公开(公告)日：2015-04-07

申请号：US14074592

申请日：2013-11-07

申请人： Western Digital Technologies, Inc.

发明人： George J. Bennett ,  Steven R. Vasquez ,  Robert P. Ryan

IPC分类号： G11B15/46 ,  G06F11/07 ,  G11B19/20

CPC分类号： G06F11/0727 ,  G11B19/041 ,  G11B19/2063 ,  G11B19/2081 ,  G11B2220/2516 ,  G11B2220/45 ,  G11B2220/63

摘要： Some embodiments of the invention are directed to a data storage system that includes a disk and solid-state non-volatile memory (NVM). During a power failure, the data storage system may use back EMF (BEMF) voltage from the spindle motor of the disk to park the heads of the disk and/or store data in the NVM. In one embodiment, a demand regulation circuit regulates loads that use voltage generated from the BEMF. The demand regulation circuit may be used to selectively cause a controller to adjust the rate of programming to the NVM in order to reduce the load. For example, the demand regulation circuit may assert a throttle signal to the controller upon detecting that the voltage generated from the BEMF is below a certain threshold. Programming rate may be throttled, programming cycles may be staggered, and/or programming time may be lengthened. Throttling may enable the use of smaller circuitry.

摘要翻译： 本发明的一些实施例涉及包括盘和固态非易失性存储器（NVM）的数据存储系统。 在电源故障期间，数据存储系统可以使用来自磁盘的主轴电机的反电动势（BEMF）电压来停放磁盘头和/或将数据存储在NVM中。 在一个实施例中，需求调节电路调节使用从BEMF产生的电压的负载。 可以使用需求调节电路来选择性地使控制器调整对NVM的编程速率，以便减少负载。 例如，当检测到从BEMF产生的电压低于某个阈值时，需求调节电路可以向控制器断言油门信号。 编程速率可能会被限制，编程周期可能会交错，和/或编程时间可能会延长。 节流可以使用更小的电路。