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51.发明授权公开(公告)号：US10600437B2
公开(公告)日：2020-03-24
申请号：US16111927
申请日：2018-08-24
发明人： Daisuke Sudo , Tatsurou Sasamoto , Takeyori Hara , Akihiko Takeo , Kazuo Chokki , Tatsuo Nitta
摘要： According to one embodiment, a magnetic disk device includes a disk including a first region and a second region different from the first region, a head that writes data on the disk and reads data from the disk, an actuator that positions the head on the disk, and a controller which positions the head by driving the actuator and writes data in the first region and the second region with the head, a skew angle of the head with respect to a circumferential direction of the disk varying within a first angle in the first region, and varying, in the second region, from a second angle larger than the first angle to a third angle larger than the first angle and the second angle.
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公开(公告)号：US20200090691A1
公开(公告)日：2020-03-19
申请号：US16266145
申请日：2019-02-04
发明人： Naoki Tagami
IPC分类号： G11B5/596
摘要： According to one embodiment, a magnetic disk device includes a disk including a recording region including a servo sector, a head configured to write data to the disk and read data from the disk, and a controller configured to acquire a plurality of correction data for a repeatable runout of the recording region, the correction data respectively corresponding to a plurality of measurement positions set based on a first linearity error acquired by reading the servo sector, and to correct a position of the head based on the correction data.
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公开(公告)号：US10573338B2
公开(公告)日：2020-02-25
申请号：US15900141
申请日：2018-02-20
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa
IPC分类号： G11B5/78 , G11B5/008 , G11B5/706 , G11B5/02 , G11B5/708 , G11B5/845 , G11B5/70 , G11B5/73 , G11B5/596 , G11B5/39
摘要： A magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a Tunneling Magnetoresistive (TMR) head, the center line average surface roughness Ra measured regarding the surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and the ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
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公开(公告)号：US20200005820A1
公开(公告)日：2020-01-02
申请号：US16456965
申请日：2019-06-28
申请人： FUJIFILM Corporation
发明人： Eiki OZAWA , Norihito KASADA , Atsushi MUSHA
摘要： A magnetic tape apparatus, in which a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element.
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公开(公告)号：US20200005819A1
公开(公告)日：2020-01-02
申请号：US16570785
申请日：2019-09-13
发明人： Jason Bellorado , Marcus Marrow , Zheng Wu
IPC分类号： G11B5/596 , H03L7/091 , H03M1/00 , G11B20/10 , H03L7/081 , H03L7/07 , H03K5/131 , H03K5/135 , H03M13/41
摘要： An apparatus may include a circuit configured to receive first and second samples of an underlying data from respective first and second sample periods and which correspond to respective first and second sensors, a phase control value may have first and second values during respective first and second sample periods. The phase control value may be a control value for a sample clock signal. The circuit may also determine a difference in the phase control value between the first value and the second value. The circuit may then digitally interpolate the first and second samples to produce a phase shifted first and second samples where the digital interpolation of at least one of the first and second samples mat be at least in part based on the difference in the phase control value to compensate for a phase misalignment between the first sample and the second sample.
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公开(公告)号：US20190392862A1
公开(公告)日：2019-12-26
申请号：US16524544
申请日：2019-07-29
发明人： Xiong Liu , Lihong Zhang , PengBoon Khoo
摘要： A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.
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公开(公告)号：US10510366B2
公开(公告)日：2019-12-17
申请号：US16232165
申请日：2018-12-26
申请人： FUJIFILM Corporation
发明人： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
IPC分类号： G11B5/09 , G11B5/39 , G11B5/66 , G11B5/596 , G11B5/592 , G11B5/55 , G11B5/008 , G11B5/584 , G11B5/70
摘要： The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.
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公开(公告)号：US10438620B1
公开(公告)日：2019-10-08
申请号：US15936215
申请日：2018-03-26
发明人： Timothy Francis Ellis , Gary Ernest Hillukka , Joshua Ward Christensen , Puskal Prasad Pokharel
摘要： Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).
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公开(公告)号：US10381035B2
公开(公告)日：2019-08-13
申请号：US14251889
申请日：2014-04-14
摘要： Methods for magnetic recording are provided. The method can include: assembling a plurality of nanoparticles into a pattern on a disc; applying a polymer composition onto the pattern of nanoparticles; curing the polymer composition to form a polymer film on the disc, wherein the plurality of nanoparticles are immobilized in the pattern within the polymer film upon curing; and removing the polymer film containing the plurality of nanoparticles in the pattern. Diffraction gratings are also provided that can include a polymeric film comprising a plurality of nanoparticles immobilized in a pattern, wherein the polymer film defines a curvature.
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公开(公告)号：US10381030B1
公开(公告)日：2019-08-13
申请号：US16034697
申请日：2018-07-13
发明人： Yanning Liu
摘要： A data storage device is disclosed comprising a voice coil motor (VCM) and a secondary actuator configured to actuate a head over a disk. A position error signal (PES) is generated based on servo data recorded on the disk, and a first control signal is generated based on the PES. The PES is adjusted based on the first control signal to generate a first adjusted PES, and a second control signal is generated based on the first adjusted PES. A secondary actuator control signal is generated based on the first control signal and the second control signal, wherein the secondary actuator control signal is applied to the secondary actuator. The first adjusted PES is adjusted based on the second control signal to generate a second adjusted PES, and a VCM control signal is generated based on the second adjusted PES, wherein the VCM control signal is applied to the VCM.
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