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公开(公告)号：US20240112700A1
公开(公告)日：2024-04-04
申请号：US18184237
申请日：2023-03-15
发明人： Takeyori HARA
IPC分类号： G11B21/02
CPC分类号： G11B21/02
摘要： According to one embodiment, a magnetic disk device comprises a feedforward control unit, which includes a plant model processing unit including a plurality of submodel processing units. Each of the submodel processing units generates a submodel output value that is an output value for an input value to be input, and the feedforward control unit generates the output value based on a plurality of the submodel output values.
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2.发明授权公开(公告)号：US11874182B1
公开(公告)日：2024-01-16
申请号：US17883989
申请日：2022-08-09
发明人： John Contreras , Joey M. Poss , Ronald Chang , Bernhard E. Knigge
摘要： Various illustrative aspects are directed to a data storage device comprising a slider with a resistive temperature detector (RTD) having a first resistance electrically connected to a first amplifier and a plurality of controlled current sources and switches, and one or more processing devices configured to: control the switches to generate an alternating-bias signal having a first clock frequency for biasing the first resistance, modulate an input signal of the first amplifier using the first clock frequency to generate a modulated signal, demodulate an amplified modulated signal at an output of a second amplifier using the first clock frequency to generate a resistance detection signal, the second amplifier coupled to the first amplifier, and process the resistance detection signal to determine the first resistance and/or a change in value of the first resistance.
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公开(公告)号：US11862195B2
公开(公告)日：2024-01-02
申请号：US17667242
申请日：2022-02-08
IPC分类号： G11B21/02
CPC分类号： G11B21/02
摘要： The present disclosure is generally related to a tape head and a tape drive including a tape head. The tape head comprises one or more head assemblies, each head assembly comprising a plurality of write heads aligned in a row, at least one writer servo head aligned with the row of write heads, a plurality of read heads aligned in a row, and at least one reader servo head aligned with the row of read heads. The writer servo head and the reader servo head are independently controllable and are configured to operate concurrently. The tape head is able to accurately and independently position the write heads using the writer servo head(s) when writing data to a tape and position the read heads using the reader servo head(s) when reading data from the tape, even if the write heads and read heads are or become mis-aligned.
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公开(公告)号：US11495263B2
公开(公告)日：2022-11-08
申请号：US17197189
申请日：2021-03-10
发明人： Daisuke Kobayashi
摘要： According to one embodiment, a magnetic disk device includes a controller that disposes a plurality of conventional magnetic recording division regions and a plurality of shingled write magnetic recording division regions in the user data region, sets, when receiving a command to write data to a first LBA, a first conventional magnetic recording region to a first conventional magnetic recording division region, and sets, when receiving a command to write data to a second LBA, a first shingled write magnetic recording region to a first shingled write magnetic recording division region.
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公开(公告)号：US20220262401A1
公开(公告)日：2022-08-18
申请号：US17176302
申请日：2021-02-16
摘要： A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write coil and a write pole. A test pattern is written to the magnetic media by applying a first current to the write coil. A second current is applied to the write coil while the head passes over the test pattern, wherein the second current has a polarity opposite the first current. After applying the second current to the write coil while the head passes over the test pattern, the test pattern is read from the magnetic media using the head to generate a first read signal, and a first noise power of the first read signal is measured. A degradation of the write pole is detected based on the first noise power measurement.
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公开(公告)号：US20220130420A1
公开(公告)日：2022-04-28
申请号：US17179753
申请日：2021-02-19
摘要： A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of data tracks, wherein each servo sector comprises a track ID followed by a sync mark followed by at least one servo burst, and a first servo sector does not include a preamble. During a read operation, a servo gate is opened in order to read the track ID, the sync mark, and the servo burst of the first servo sector. During a write operation, the servo gate is opened in order to miss reading at least part of the track ID of the first servo sector so as to reduce a write gap preceding the first servo sector.
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公开(公告)号：US20210249042A1
公开(公告)日：2021-08-12
申请号：US17240691
申请日：2021-04-26
发明人： Masahito KOBAYASHI
IPC分类号： G11B5/584 , G11B21/02 , G11B23/087 , G11B25/06 , G11B33/14 , G11B5/008 , G11B5/48 , G11B5/55
摘要： A storage device comprises tape reel(s) holding tape media for storing data, a head assembly, motor(s) configured to actuate the head assembly, a sealed casing, and a printed circuit board assembly (PCBA) configured to control operations of the motor(s). The head assembly comprises a support structure, a head bar with read head(s) and write head(s), and a suspension system connecting the head bar to the support structure. The sealed casing encloses in its interior the tape reel(s), the head assembly, and the motor(s). Meanwhile, the PCBA is mounted on an external surface of the casing.
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公开(公告)号：US10600439B2
公开(公告)日：2020-03-24
申请号：US16296214
申请日：2019-03-07
申请人： FUJIFILM CORPORATION
发明人： Hodaka Suzuki , Yoichi Akano
摘要： Provided is a magnetic tape, in which servo patterns, each including a first magnetization region formed to be tilted with respect to a width direction of a servo band by an angle θ along the width direction of the servo band and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, are repeatedly formed in a longitudinal direction of the servo band, the magnetic tape is used in a recording and reproducing system which uses a reproducing element for reproducing the servo pattern, a width of which satisfies W1≤(1/tan θ)×stripe width T of the servo pattern, and the angle θ is greater than 25° and equal to or smaller than 45°.
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公开(公告)号：US10325619B2
公开(公告)日：2019-06-18
申请号：US15813374
申请日：2017-11-15
发明人： Kurt Wiesen , Javier Guzman , Joseph Mundenar , Michael Conover
摘要： A method of forming a recording head for use with a data storage medium in a data storage device. The method includes forming first and second writers of different target geometries. A first recording measurement is performed on one or more storage media using the first writer. A second recording measurement is performed on the one or more storage media using the second writer. Based on a comparison of the first and second recording measurements to a predetermined quantity, either the first writer or the second writer is selected to be operational in the data storage device.
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公开(公告)号：US20190035427A1
公开(公告)日：2019-01-31
申请号：US16145883
申请日：2018-09-28
发明人： Larry D. Gartee
摘要： An apparatus and method for dynamic multiple actuator drive data access are disclosed. A particular embodiment includes: receiving a data transfer request including at least one data package; determining a type of the data transfer request; partitioning the data package into a plurality of data segments, if the data transfer request is a parallel data mode request; assigning one or more actuator drivers and one or more actuator controllers for the data transfer request; initiating a data transfer to or from the data storage medium using one or more of the plurality of actuators corresponding to the one or more assigned actuator controllers; storing or retrieving an individual data package of the data transfer request to or from the data storage medium wherein the entire data package is wholly accessible to a single actuator, if the data transfer request is a random data mode request; and storing or retrieving an individual data segment of the data transfer request to or from the data storage medium wherein the data package is accessible to the plurality of actuators, if the request is a parallel data mode request.
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