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1.发明申请公开(公告)号：US20230097702A1
公开(公告)日：2023-03-30
申请号：US17690744
申请日：2022-03-09
发明人： Sho SUZUKI , Takayuki KAWABE , Takeyori HARA , Daisuke SUDO
摘要： A magnetic disk device includes a plurality of magnetic heads, a storage unit that stores a table storing, for each of the magnetic heads, a track skew value obtained by adding a head shared value and a head unique value, and a control unit that reads out the track skew value corresponding to one of the magnetic heads to be operated from the table and performs seek control.
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公开(公告)号：US11581012B1
公开(公告)日：2023-02-14
申请号：US17543209
申请日：2021-12-06
发明人： Jianbin Nie , Trung Trieu , Bryson Mitsui
摘要： Various illustrative aspects are directed to a data storage device. The data storage device comprises a first actuator; a second actuator; a first set of disks, comprising one or more disks configured to correspond with the first actuator; a second set of disks, comprising one or more disks configured to correspond with the second actuator; and one or more processing devices. The one or more processing devices are configured to: write final spirals on the first set of disks; determine a time delta to implement cross-actuator alignment between the first set of disks and the second set of disks; and apply the time delta in writing final spirals for the second set of disks.
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公开(公告)号：US11557319B1
公开(公告)日：2023-01-17
申请号：US17410840
申请日：2021-08-24
摘要： A hard disk drive includes a magnetic recording medium comprising data sectors along a data track, a read head arranged to read data from the data sectors, and an integrated circuit. The integrated circuit includes circuitry programmed to detect a read error associated with a first of the data sectors and continue to read data from the data sectors after the detection of the read error.
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公开(公告)号：US11495255B2
公开(公告)日：2022-11-08
申请号：US17387232
申请日：2021-07-28
发明人： Fumiya Kudo
摘要： According to one embodiment, a method for manufacturing a magnetic disk device includes: moving a magnetic head such that a read head is located on a first learning position among a plurality of learning positions set in a radial direction of a magnetic disk; and learning RRO correction information related to the first learning position using the read head. The method further includes: moving the magnetic head such that the read head is located on a second learning position among the plurality of learning positions; and executing writing of the RRO correction information related to the first learning position using the write head in parallel while learning RRO correction information related to the second learning position using the read head when the read head is located on the second learning position.
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公开(公告)号：US11469666B2
公开(公告)日：2022-10-11
申请号：US16589214
申请日：2019-10-01
发明人： Kapil Kesarwani , Mackenzie Tope
摘要： A control circuit for a voltage regulator includes a divider coupled to the regulated output voltage to generate a divided voltage having a value that is a fraction of the regulated output voltage, an ADC responsive to the divided voltage to generate a feedback control signal, a digital compensator responsive to the feedback control signal and to a feedforward control signal scaled by a feedforward gain value to generate a compensator signal, and a pulse width modulator responsive to the compensator signal to generate a voltage control signal to control a switch of the voltage regulator. The digital compensator includes a register configured to store a value indicative of the input voltage and a feedforward gain unit configured to generate the feedforward gain value in response to the value indicative of the input voltage. In embodiments, the feedforward gain value is generated in response to the square of the value indicative of the input voltage. The feedforward gain value can be updated each time the value indicative of the input voltage is updated.
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公开(公告)号：US11456014B1
公开(公告)日：2022-09-27
申请号：US17494825
申请日：2021-10-05
发明人： Zaifeng Chen , Chuanwen Ji
摘要： Generating a hard disk drive (HDD) data track repeatable runout (RRO) compensation value for a target track involves querying at least one RRO table for a closest track to the target track external servo target (EST) and identifying an ESTx corresponding to the closest track, computing a first absolute value of the difference between the EST and the ESTx, and responsive to the first absolute value being less than an approximation threshold, setting the RRO compensation value for the target track to the RRO compensation value for the closest track. Else, querying the RRO table(s) for each adjacent track to the target track, computing the difference between the ESTs for the adjacent tracks, and responsive to the second absolute value being less than an interpolation threshold, determining an RRO compensation value for the target track based on RRO compensation values corresponding to the adjacent tracks.
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公开(公告)号：US20220301587A1
公开(公告)日：2022-09-22
申请号：US17461859
申请日：2021-08-30
摘要： A controller for a magnetic disk device acquires a reproduction signal of servo burst data while moving a magnetic head along data tracks that intersect servo tracks at a plurality of points. The controller acquires correction values for correcting repeatable runout on a per servo sector basis based on the reproduction signal. The correction values include a first correction value, which is a correction value for a servo sector at a position where the data track and the servo track are substantially parallel to each other and a second correction value, which is a correction value fora servo sector at a position where the data track and the servo track are not substantially parallel to each other. The controller adjusts the first correction value based on the second correction value, and writes the correction values including the adjusted first correction value onto a magnetic disk.
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公开(公告)号：US11410693B2
公开(公告)日：2022-08-09
申请号：US15931412
申请日：2020-05-13
发明人： Kuen Chee Ee , Long Zhang , David Glaess
摘要： A flexure assembly is described. The flexure assembly includes a gimbal portion on configured to receive a slider. The gimbal portion includes a first surface and a second surface which is opposite to the first surface. The slider is mounted on the second surface. The flexure assembly also includes a pair of microactuator elements. The flexure assembly also includes a tongue of the gimbal portion on which the slider is mounted. The tongue includes a dimple point which represents the center of the tongue. The flexure assembly also includes a pair of first supporting portions and a pair of second supporting portions of the gimbal portion. A pair of end portions are individually secured to the tongue and the first supporting portions and the pair of second supporting portions. The flexure assembly also includes a conductive circuit portion unsupported between a first stationary part and the pair of end portions.
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公开(公告)号：US20220230660A1
公开(公告)日：2022-07-21
申请号：US17715365
申请日：2022-04-07
申请人： SONY CORPORATION
发明人： Masaru TERAKAWA , Minoru YAMAGA
摘要： A magnetic recording medium is provided and includes a layer structure including a magnetic layer, a non-magnetic layer, and a base layer in order, in which an average thickness tT of the magnetic recording medium is 4.0 μm≤tT≤5.3 μm, a dimensional variation Δw in a width direction of the magnetic recording medium to tension change in a longitudinal direction of the magnetic recording medium is 680 ppm/N≤Δw≤2000 ppm/N , and an average thickness tn of the non-magnetic layer is tn≤1.0 μm.
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10.发明授权公开(公告)号：US11386927B1
公开(公告)日：2022-07-12
申请号：US17330675
申请日：2021-05-26
摘要： A data storage device configured to access a magnetic tape is disclosed comprising a plurality of data tracks. A first head is configured to access a first data track comprising a first sync mark, and a second head is configured to access a second data track comprising a second sync mark. The first head is used to read first data from the first data track, wherein the first data comprises a plurality of symbols, and the second head is used to read the second sync mark from the second data track. The first data is symbol synchronized based on the second head reading the second sync mark from the second data track.
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