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公开(公告)号：US10008231B2
公开(公告)日：2018-06-26
申请号：US15795044
申请日：2017-10-26
Applicant: Seagate Technology LLC
Inventor： Steven Granz , Edward Gage , Alfredo Chu , Wenzhong Zhu
IPC: G11B11/00 , G11B7/1263 , G11B7/126 , G11B5/60 , G11B7/1267 , G11B20/12 , G11B5/00
CPC classification number: G11B7/1263 , G11B5/012 , G11B5/6088 , G11B7/126 , G11B7/1267 , G11B20/1217 , G11B2005/0021 , G11B2020/1238
Abstract: A storage device includes a storage controller configured to operate a heat-assisted magnetic recording head to write data to a band of consecutive data tracks in a consecutive track order while selectively alternating a power level of the heat source when writing to some data tracks of the band.
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公开(公告)号：US09978403B1
公开(公告)日：2018-05-22
申请号：US15435839
申请日：2017-02-17
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Alfredo Sam Chu , Siew Kin Chow
CPC classification number: G11B5/3123 , G11B5/3103 , G11B5/3106 , G11B5/3133 , G11B5/3967 , G11B5/4826 , G11B5/4866 , G11B5/607 , G11B5/6088 , G11B13/04 , G11B2005/0021
Abstract: Data is written to a recording medium via a read/write head. Subsequent to the writing, the data is read via a read transducer of a read/write head. An instability indicator is derived based on measurements performed while the reading the data. If the instability indicator exceeds a threshold, a current applied to a write coil of the read/write head is changed for subsequent write operations.
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公开(公告)号：US09818438B1
公开(公告)日：2017-11-14
申请号：US15281219
申请日：2016-09-30
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Gary E. Hillukka , Bin Huang
CPC classification number: G11B5/59627 , G11B5/56
Abstract: A system may compensate for skew in a patterned medium, such as but not limited to a self-assembling bit patterned medium, with a write pole separated from a data storage medium by an air bearing. The write pole being connected to a controller. The data storage medium can have a plurality of magnetic islands arranged in data tracks with each data track having a track center. The write pole may be selectively shifted from the track center by the controller to compensate for a skewed write pole configuration.
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公开(公告)号：US09747943B2
公开(公告)日：2017-08-29
申请号：US15427949
申请日：2017-02-08
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Kaizhong Gao , Edward Gage
CPC classification number: G11B20/1217 , G06F12/0238 , G06F2212/1044 , G06F2212/152 , G06F2212/21 , G06F2212/70 , G11B5/012 , G11B5/09 , G11B2020/1238 , G11B2020/1292
Abstract: A storage device includes a controller that directs incoming data to a storage location based on a capacity of a region or surface of a magnetic disc. According to one implementation, the storage device controller writes new data to data tracks in a first series of data tracks on the magnetic disc until a capacity condition is satisfied. Once the capacity condition is satisfied, the storage device controller writes new data to a second series of data tracks on the storage medium that are interlaced with data tracks of the first series.
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公开(公告)号：US20170243609A1
公开(公告)日：2017-08-24
申请号：US15591270
申请日：2017-05-10
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Wenzhong Zhu , Kenneth A. Haapala , Bin Huang
CPC classification number: G11B5/59627 , G11B5/012 , G11B5/40 , G11B19/046 , G11B20/18 , G11B27/36 , G11B33/144
Abstract: Systems and methods for determining a relationship between write fault threshold and temperature are described. The systems and methods include measuring an operating temperature of the storage device, determining a current operating temperature of the storage device, determining whether the current operating temperature of the storage device satisfies a temperature threshold, and upon determining the current operating temperature of the storage device satisfies the temperature threshold, modifying a write fault threshold associated with a data track of the storage device.
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Patent Agency Ranking
公开(公告)号：US09679601B2
公开(公告)日：2017-06-13
申请号：US15089239
申请日：2016-04-01
Applicant: Seagate Technology LLC
Inventor： Kaizhong Gao , Wenzhong Zhu , Tim Rausch , Edward Gage
CPC classification number: G11B20/10212 , G11B5/012 , G11B20/1217 , G11B20/1833 , G11B2005/0021 , G11B2020/10898 , G11B2020/1238 , G11B2020/1292 , G11B2020/1869
Abstract: A storage device includes a data degradation management module that tracks a risk of data degradation by incrementing a track write counter of a first data track responsive to each data write command to a second data track, such as a data track directly adjacent to the first data track. If a count of the track write counter exceeds a count threshold, one or more post-write scan operations are performed to assess and/or repair data degradation of the first data track.
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公开(公告)号：US09626989B1
公开(公告)日：2017-04-18
申请号：US14861369
申请日：2015-09-22
Applicant: Seagate Technology LLC
Inventor： Bruce Buch , Wenzhong Zhu
CPC classification number: G11B5/02 , G11B2005/0021 , G11B2220/252
Abstract: A heat-assisted magnetic recording (HAMR) device includes transducer head comprising a heat source and a writer. The HAMR device further includes a power controller configured to selectively power on and off the heat source independent of current flowing through a write coil of the writer based on a position of the transducer head relative to an adjacent rotating media.
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38.发明授权Perpendicular magnetic recording media with magnetic anisotropy gradient and local exchange coupling 有权具有磁各向异性梯度和局部交换耦合的垂直磁记录介质公开(公告)号：US09548074B2
公开(公告)日：2017-01-17
申请号：US14629781
申请日：2015-02-24
Applicant: Seagate Technology LLC
Inventor： Shaoping Li , Kaizhong Gao , Lei Wang , Wenzhong Zhu , Xiaobin Wang
IPC: G11B5/64 , G11B5/667 , B82Y10/00 , G11B5/74 , G11B5/82 , G11B5/66 , H01F41/02 , G11B5/65 , G11B5/00
CPC classification number: G11B5/667 , B82Y10/00 , G11B5/64 , G11B5/65 , G11B5/656 , G11B5/66 , G11B5/743 , G11B5/746 , G11B5/82 , G11B2005/0029 , H01F41/0206 , Y10S428/90 , Y10T29/4902 , Y10T29/49032 , Y10T29/49067 , Y10T428/12458 , Y10T428/12465 , Y10T428/12931 , Y10T428/26 , Y10T428/265
Abstract: A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic coercivity Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.
Abstract translation: 适用于高记录密度和高数据记录速率的垂直磁记录介质包括具有至少一个具有在其上形成层叠层的表面的非磁性基板，该层堆叠包括垂直记录层，该垂直记录层包含多个柱状磁性颗粒 垂直于衬底表面延伸一段长度，第一端远离表面，靠近表面的第二端，其中每个磁性颗粒具有：（1）垂直磁矫顽力Hk沿其长度在第一 末端和末端; 和（2）沿着长度的预定局部交换耦合强度。
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公开(公告)号：US09524743B2
公开(公告)日：2016-12-20
申请号：US14734235
申请日：2015-06-09
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Kaizhong Gao , Edward Gage
IPC: G11B5/09 , G11B7/1263 , G11B5/74 , G11B5/012 , G11B5/00
CPC classification number: G11B7/1263 , G11B5/012 , G11B5/09 , G11B5/746 , G11B2005/0021 , G11B2220/252
Abstract: A heat-assisted magnetic recording (HAMR) device includes a controller that selects a power for operating a heat source for a data write to a target data track. According to one implementation, the controller selects the power based on an assessment of whether the target data track is bounded by any data-storing tracks. A first power is selected when the data track is not bounded by any data-storing tracks and a second lower power is selected when the data track is bounded by one or more data-storing tracks. In another implementation, the controller writes to different partitioned regions of a storage media with different powers of the heat source. The controller selects a storage location for data based on an expected write error rate and environmental conditions within the HAMR device.
Abstract translation: 热辅助磁记录（HAMR）装置包括控制器，其选择用于操作热源以用于对目标数据轨道进行数据写入的功率。 根据一个实施方案，控制器基于对目标数据轨道是否由任何数据存储轨道限定的评估来选择功率。 当数据轨道不被任何数据存储轨道限制时，选择第一功率，并且当数据轨道由一个或多个数据存储轨道限定时选择第二较低功率。 在另一实现中，控制器向不同功率的热源的存储介质写入不同的分区。 控制器根据预期的写错误率和HAMR设备内的环境条件选择数据的存储位置。
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40.发明授权Repeated runout (RRO) compensation for alternating tracks in an interlaced magnetic recording system 有权在隔行磁记录系统中交替轨迹的重复跳动（RRO）补偿公开(公告)号：US09508370B1
公开(公告)日：2016-11-29
申请号：US15165492
申请日：2016-05-26
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Peter S. Harllee , Ralph William Cross , Kenneth A. Haapala , Edward Charles Gage
IPC: G11B5/596
CPC classification number: G11B5/59627
Abstract: Method and apparatus for controlling the position of a control object in a closed loop control system, such as a servo control system used in a data storage device. In some embodiments, spaced apart first and second data tracks are written to a rotatable data recording medium without using repeated runout (RRO) compensation values to correct for RRO error in servo data written to the medium. A third data track is subsequently written so as to be interspersed between and partially overlap the first and second data tracks. The third data track is written using a set of RRO compensation values to correct for the RRO error in the servo data.
Abstract translation: 用于控制诸如在数据存储装置中使用的伺服控制系统的闭环控制系统中的控制对象的位置的方法和装置。 在一些实施例中，将间隔开的第一和第二数据磁道写入可旋转的数据记录介质，而不使用重复的跳动（RRO）补偿值来校正写入介质的伺服数据中的RRO误差。 随后写入第三数据磁道，以便分散在第一和第二数据磁道之间并部分重叠。 使用一组RRO补偿值来写入第三条数据轨道，以校正伺服数据中的RRO错误。
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