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公开(公告)号：US10783910B2
公开(公告)日：2020-09-22
申请号：US16571475
申请日：2019-09-16
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Kenneth Haapala , Jon D. Trantham
Abstract: A recording surface of a magnetic disk is divided into first and second zones. A first head of a first actuator arm assembly reads from and/or writes to the first zone exclusively. A second head of a second actuator arm assembly reads from and/or writes to the second zone exclusively. The first and second head are capable of simultaneously reading from and writing to the recording surface.
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公开(公告)号：US10366719B1
公开(公告)日：2019-07-30
申请号：US15925927
申请日：2018-03-20
Applicant: Seagate Technology LLC
Inventor： Jason W. Riddering , Dustin Mark Cvancara , Kenneth A. Haapala , Eric John McCalla , Wenzhong Zhu , Bin Huang
Abstract: A clearance heater of a write head is engaged with a boosted current that exceeds a steady-state current. The steady-state current causes the write head to maintain a desired clearance over a disk during writing, the boosted current being applied before a start of the writing. The boosted current is monotonically decreased before the start of the writing and the steady-state current is applied to the heater after the start of the writing.
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公开(公告)号：US09842619B1
公开(公告)日：2017-12-12
申请号：US15139432
申请日：2016-04-27
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Wenzhong Zhu , Tim Rausch
CPC classification number: G11B7/1267 , G11B5/012 , G11B5/02 , G11B5/455 , G11B5/5534 , G11B20/10388 , G11B20/105 , G11B20/1816 , G11B2005/0021 , G11B2020/1275
Abstract: A set of consecutive user data wedges are each located between consecutive servo wedges of a heat-assisted recording medium. Test data is written at least every other one of the consecutive data wedges using different laser power values. Based on reading the test data, a nominal laser power is selected for use by the read/write head.
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公开(公告)号：US09842047B2
公开(公告)日：2017-12-12
申请号：US14688515
申请日：2015-04-16
Applicant: Seagate Technology LLC
Inventor： Kaizhong Gao , Wenzhong Zhu , Tim Rausch , Edward Gage
CPC classification number: G06F12/0238 , G06F2212/1044 , G06F2212/152 , G06F2212/21 , G06F2212/70 , G11B5/012 , G11B20/1217 , G11B2020/1238 , G11B2020/1267 , G11B2020/1292
Abstract: A storage device controller addresses consecutively-addressed portions of incoming data to consecutive data tracks on a storage medium and writes the consecutively-addressed portions to the consecutive data tracks in a non-consecutive track order. In one implementation, the storage device controller reads the data back from the consecutive data tracks in a consecutive address order in a single sequential read operation.
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公开(公告)号：US20170330591A1
公开(公告)日：2017-11-16
申请号：US15154010
申请日：2016-05-13
Applicant: Seagate Technology LLC
Inventor： Steven Granz , Edward Gage , Alfredo Chu , Wenzhong Zhu
IPC: G11B7/1263 , G11B7/126 , G11B20/12 , G11B5/60 , G11B7/1267 , G11B5/00
CPC classification number: G11B7/1263 , 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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Patent Agency Ranking
公开(公告)号：US09728206B2
公开(公告)日：2017-08-08
申请号：US14686561
申请日：2015-04-14
Applicant: Seagate Technology LLC
Inventor： Kaizhong Gao , Wenzhong Zhu , Edward Gage
CPC classification number: G11B20/1889 , G11B5/012 , G11B5/09 , G11B5/59633 , G11B5/59638 , G11B5/6088 , G11B11/10506 , G11B11/10515 , G11B11/10521 , G11B11/10595 , G11B20/12 , G11B20/1217 , G11B20/1833 , G11B27/3027 , G11B2005/0021 , G11B2020/1222 , G11B2020/1232 , G11B2020/1238 , G11B2020/1292
Abstract: A storage device includes a transducer head including a first write element configured to write data at a first write width and a second write element configured to write data at a second write width less than the first write width. According to one implementation, the first write element writes data at a first linear density and to alternating data tracks and the second write element writes data at a second linear density and to data tracks interlaced with the alternating data tracks.
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7.发明授权Adjusting laser power to achieve equivalent track spacing for paired heads that simultaneously write to a heat-assisted recording medium 有权调整激光功率以实现同时写入热辅助记录介质的成对磁头的等效轨道间距公开(公告)号：US09495995B1
公开(公告)日：2016-11-15
申请号：US14834886
申请日：2015-08-25
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Kenneth Haapala , Jon Trantham , Edward Charles Gage
CPC classification number: G11B7/1263 , G11B5/012 , G11B5/02 , G11B5/6088 , G11B20/10453 , G11B2005/0021
Abstract: A relatively larger nominal track spacing associated with a first write head is determined and a relatively smaller nominal track spacing associated with a second write head is determined. The first and second write heads simultaneously write to respective different first and second surfaces of a heat-assisted recording medium. A laser write power for a selected one of the first write head and the second write head is changed to enable the first write head and the second write head to operate at an equivalent nominal track spacing.
Abstract translation: 确定与第一写入头相关联的相对较大的标称磁道间隔，并且确定与第二写入头相关联的相对较小的标称磁道间隔。 第一和第二写入头同时写入热辅助记录介质的各个不同的第一和第二表面。 第一写入头和第二写入头中的所选择的一个的激光写入功率被改变，使得第一写头和第二写头能够以等效的标称磁道间隔工作。
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8.发明授权Read sensor with free layers of different widths sandwiching a SAF structure for extremely high resolution 有权读取具有不同宽度的自由层的传感器，夹持SAF结构以实现极高的分辨率公开(公告)号：US09401162B1
公开(公告)日：2016-07-26
申请号：US14826779
申请日：2015-08-14
Applicant: Seagate Technology LLC
Inventor： Kaizhong Gao , Wenzhong Zhu , Edward Gage
CPC classification number: G11B5/3932 , G11B5/3906 , G11B5/3912 , G11B5/3948 , G11B5/3958 , G11B5/398
Abstract: A read sensor that includes an air bearing surface and a synthetic antiferromagnetic (SAF) structure. The read sensor also includes a first free layer (FL) above the SAF structure and a second FL below the SAF structure. The first FL and the second FL have differing widths at the bearing surface. The first FL, the second FL and the SAF structure are configured to provide a reader resolution that corresponds to a difference between a first width of the first FL and a second width of the second FL.
Abstract translation: 包括空气轴承表面和合成反铁磁（SAF）结构的读取传感器。 读取传感器还包括在SAF结构之上的第一自由层（FL）和SAF结构之下的第二FL。 第一FL和第二FL在轴承表面具有不同的宽度。 第一FL，第二FL和SAF结构被配置为提供对应于第一FL的第一宽度和第二FL的第二宽度之间的差的读取器分辨率。
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9.发明授权Write parameters used to ensure accurate phase lock during reading of a heat-assisted magnetic recording medium 有权写入参数，以确保读取热辅助磁记录介质时的精确锁相公开(公告)号：US09240205B1
公开(公告)日：2016-01-19
申请号：US14624100
申请日：2015-02-17
Applicant: Seagate Technology LLC
Inventor： Kaizhong Gao , Pu-Ling Lu , Edward Charles Gage , Wenzhong Zhu
CPC classification number: G11B7/1263 , G11B5/012 , G11B5/02 , G11B5/3133 , G11B5/455 , G11B5/4866 , G11B5/59616 , G11B5/6011 , G11B5/6088 , G11B2005/0021
Abstract: Based on thermal time constant of a head-to-media spacing of a write head, a write parameter is determined that includes at least one of: a modified laser power boost used at a beginning of writing; and a time adjustment affecting the beginning of the writing. The write parameter is applied to writing operations affecting a heat-assisted magnetic recording medium, the write parameter ensuring accurate phase lock during reading of the heat-assisted magnetic recording medium.
Abstract translation: 基于写头的头对媒体间隔的热时间常数，确定写入参数，其包括以下中的至少一个：在写入开始时使用的修改的激光功率提升; 以及影响写作开始的时间调整。 写入参数适用于影响热辅助磁记录介质的写入操作，写入参数确保在读取热辅助磁记录介质期间精确锁相。
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公开(公告)号：US10665254B1
公开(公告)日：2020-05-26
申请号：US16412928
申请日：2019-05-15
Applicant: Seagate Technology LLC
Inventor： Drew Michael Mader , Wenzhong Zhu
Abstract: A read channel is configured to obtain an analog readback waveform from a magnetic recording medium of a disk drive at a sampling rate of one sample per one written bit. A buffer is coupled the read channel. Circuitry is configured to inject a plurality of different phase offsets into the read channel for each of a plurality of revolutions of the medium. The circuitry is also configured to store, in a buffer, an amplitude of the readback waveform for each of the different phase offsets. The circuitry is further configured to generate an oversampled readback waveform using the amplitudes stored in the buffer.
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