公开(公告)号：US20200327904A1

公开(公告)日：2020-10-15

申请号：US16857133

申请日：2020-04-23

申请人： Magnecomp Corporation

发明人： David Glaess ,  Kuen Chee Ee ,  Long Zhang ,  Chris Dunn

IPC分类号： G11B5/48 ,  G11B5/596

摘要： A PZT microactuator such as for a hard disk drive has a restraining layer bonded on its side that is opposite the side on which the PZT is mounted. The restraining layer comprises a stiff and resilient material such as stainless steel. The restraining layer can cover most or all of the top of the PZT, with an electrical connection being made to the PZT where it is not covered by the restraining layer. The restraining layer reduces bending of the PZT as mounted and hence increases effective stroke length, or reverses the sign of the bending which increases the effective stroke length of the PZT even further. The restraining layer can be one or more active layers of PZT material that act in the opposite direction as the main PZT layer. The restraining layer(s) may be thinner than the main PZT layer.

公开(公告)号：US20200286513A1

公开(公告)日：2020-09-10

申请号：US16882956

申请日：2020-05-26

申请人： KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

发明人： Thorsten SCHMIDT ,  Gary W. CALFEE ,  Gabor SZITA ,  Hieu PHAM

IPC分类号： G11B5/596 ,  G11B5/55 ,  G11B5/29

摘要： A self servo-write process in performed on two or more recording surfaces simultaneously. In a dual-stage servo system, a first fine positioning servo system that includes a first microactuator independently controls the position of a first read/write head over a first recording surface of a hard disk drive, while a second fine positioning servo system that includes a second microactuator independently controls the position of a second read/write head over a second recording surface of the hard disk drive.

公开(公告)号：US10755734B2

公开(公告)日：2020-08-25

申请号：US16570785

申请日：2019-09-13

申请人： Seagate Technology LLC

发明人： Jason Bellorado ,  Marcus Marrow ,  Zheng Wu

IPC分类号： G11B5/596 ,  G11B20/10 ,  H04L25/03 ,  G06F13/10 ,  G06F13/42 ,  H03K5/131 ,  H03M1/00 ,  H03M13/41 ,  H03K5/135 ,  H03L7/07 ,  H03L7/081 ,  H03L7/091 ,  H03G3/20 ,  H03M1/12 ,  H04L7/00 ,  H03M13/29 ,  H04B1/7105 ,  H03K5/00 ,  H04L7/033

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.

公开(公告)号：US20200265867A1

公开(公告)日：2020-08-20

申请号：US16509549

申请日：2019-07-12

申请人： Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

发明人： Yusuke Tomoda ,  Takeyori Hara ,  Nobuhiro Maeto

IPC分类号： G11B5/596 ,  G11B20/12

摘要： According to one embodiment, a magnetic disk device includes a magnetic head, a magnetic disk on which a servo pattern used to position the magnetic head when data is to be recorded by means of the magnetic head is recorded, and a control section configured to set a recording condition for each predetermined unit of the magnetic disk on the basis of the servo pattern, and carry out recording of data on the magnetic disk according to the set recording condition.

公开(公告)号：US10748569B1

公开(公告)日：2020-08-18

申请号：US16560582

申请日：2019-09-04

申请人： Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

发明人： Takuya Ogawa ,  Fumiya Kudo ,  Naoki Tagami

IPC分类号： G11B5/09 ,  G11B5/596 ,  G11B20/10

摘要： According to one embodiment, a magnetic disk device includes a disk including two first servo sectors arranged side by side in a circumferential direction and a second servo sector located between the two first servo sectors, a head that writes data to the disk and reads data from the disk, and a controller that adjusts a second timing at which the second servo sector is demodulated based on a first timing at which the first servo sector is demodulated, and corrects a first initial phase of a first demodulation signal obtained by demodulating the second servo sector at the second timing, based on a first amplitude of the first demodulation signal.

公开(公告)号：US10734022B2

公开(公告)日：2020-08-04

申请号：US16541885

申请日：2019-08-15

申请人： Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

发明人： Daisuke Sudo

IPC分类号： G11B5/09 ,  G11B5/55 ,  G11B5/596

摘要： According to one embodiment, a magnetic disk device includes a disk, a first head, a second head, an actuator configured to position the first head and the second head over the disk, and a controller configured to control the actuator based on a first value having a first waveform suppressing a disturbance component, wherein the controller is configured to invert, in the first waveform, a polarity of a third waveform succeeding a first timing with respect to a polarity of a second waveform preceding the first timing in a case where the first head is changed to the second head at the first timing.

公开(公告)号：US10714133B1

公开(公告)日：2020-07-14

申请号：US16583832

申请日：2019-09-26

申请人： Western Digital Technologies, Inc.

发明人： Brian Johnson ,  Ryan Mayo ,  Jaesoo Byoun

IPC分类号： G11B5/55 ,  G11B5/596

摘要： A data storage device is disclosed comprising a first actuator configured to actuate a head over a disk, a second actuator configured to rotate the disk, a first control circuit configured to generate a servo command, and a second control circuit configured to receive the servo command from the first control circuit, control the first actuator or the second actuator using the servo command, and override the servo command to avoid an overcurrent condition.

公开(公告)号：US20200211592A1

公开(公告)日：2020-07-02

申请号：US16727181

申请日：2019-12-26

申请人： FUJIFILM Corporation

发明人： Norihito KASADA

IPC分类号： G11B5/735 ,  G11B5/596 ,  G11B5/706 ,  G11B23/107

摘要： Provided are a magnetic tape including: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer has a servo pattern, a center line average surface roughness Ra measured on a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an absolute value ΔN of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 to 0.40, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.

公开(公告)号：US10685678B2

公开(公告)日：2020-06-16

申请号：US16583815

申请日：2019-09-26

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Richard M. Ehrlich

IPC分类号： G11B5/54 ,  G11B21/08 ,  G11B5/012 ,  G11B5/596

摘要： A dual-stage servo system of a disk drive includes a first fine positioning servo system with a first microactuator that independently controls the position of a first read/write head over a first recording surface and a second fine positioning servo system with a second microactuator that independently controls the position of a second read/write head over a second recording surface. The first microactuator accesses a first data stripe while the second fine positioning servo system simultaneously accesses a second data stripe. Data can be transferred to or from the first and second data stripes simultaneously.

公开(公告)号：US10665256B2

公开(公告)日：2020-05-26

申请号：US15791190

申请日：2017-10-23

申请人： Seagate Technology LLC

发明人： Jason Bellorado ,  Marcus Marrow ,  Zheng Wu

IPC分类号： G11B5/596 ,  G11B20/10 ,  H04L25/03 ,  H03K5/131 ,  H03M1/00 ,  H03M13/41 ,  H03K5/135 ,  H03L7/07 ,  H03L7/081 ,  H03L7/091 ,  H04L7/00 ,  H03M13/29 ,  H04B1/7105 ,  H03K5/00 ,  H04L7/033

摘要： An apparatus may include a circuit configured to receive a first phase control value of a phase control value signal, generate a first phase interpolator control signal value of a phase interpolator control signal and generate a first digital interpolator control signal value of a digital interpolator control signal. The apparatus may further be configured to phase interpolate a clock signal based on the first phase interpolator control signal value to produce a phase shifted clock signal and digitally interpolate a digital sample based on the first digital interpolator signal value to produce a phase shifted digital sample having an effective phase based on the first phase control value, the digital sample generated using the phase shifted clock signal as a sample clock.