Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation Assigned Fourteen Patents

Magnetic disk device, control method, and non-transitory computer-readable storage medium
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11756580) developed by Suzuki; Sho, Yokohama, Japan, Kawabe; Takayuki, Sagamihara, Japan, Hara; Takeyori, and Sudo; Daisuke, Kawasaki, Japan, for “magnetic disk device, control method, and non-transitory computer-readable storage medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “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.”

The patent application was filed on 2022-03-09 (17/690744).

Disk device with ramps
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11749308) developed by Kato; Yasuhiko, Setagaya Tokyo, Japan, for a “disk device with ramps.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A disk device includes magnetic disks, ramps, suspensions, and magnetic disks. The magnetic disks are arranged above a housing bottom and configured to be rotated around a first rotation axis. The ramps are arranged above the housing bottom. The suspensions are configured to be rotated around a second rotation axis parallel to the first rotation axis, The magnetic heads are mounted on the suspensions, respectively. Each of the suspensions is configured to be rotated around the second rotation axis from a first position above or below one of the magnetic disks to a second position on one of the ramps. The plurality of ramps includes a first ramp and a second ramp that is above the first ramp. An inner end of the second ramp is closer to the first rotation axis than is an inner end of the first ramp.”

The patent application was filed on 2022-03-01 (17/683742).

Magnetic disk device and method of generating write data
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11735209) developed by Okubo; Tomokazu, Kawasaki Kanagawa, Japan, for “magnetic disk device and method of generating write data.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device, including a disk, a head to write data to the disk and read data from the disk, a preamplifier to generate a recording current corresponding to data that the head writes to the disk, and a controller to convert a first data pattern in first write data, in accordance with a pattern length of a second data pattern previous to the first data pattern, to a different data pattern including a pseudo polarity inversion that does not cause a polarity inversion when converting the first data pattern to the recording current.”

The patent application was filed on 2022-03-08 (17/653943).

Magnetic disk device and method of writing spiral patterns
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11735215) developed by Kuwahara; Satoshi, Kawasaki Kanagawa, Japan, for “magnetic disk device and method of writing spiral patterns.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device includes a disk, first and second heads, a motor, and a controller. The disk includes a first surface and a second surface opposite to the first surface. The first head is configured to perform reading and writing with respect to the first surface. The second head is configured to perform reading and writing with respect to the second surface. The motor is configured to move the first and second heads with respect to the first and second surfaces, respectively, along a radial direction of the disk. The controller is configured to alternately activate the first and second heads to perform writing of a plurality of spiral patterns on the first and second surfaces of the disk, respectively, while controlling the motor to move the first and second heads at a predetermined constant speed with respect to the first and second surfaces in the radial direction.”

The patent application was filed on 2022-03-03 (17/685910).

Magnetic disk device and method of changing recording mode
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11735221) developed by Tomoda; Yusuke, Kawasaki Kanagawa, Japan, for “magnetic disk device and method of changing recording mode.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a disk, a head including a read head that reads data from the disk, a write head that writes data to the disk, and an assist element that generates energy to enhance write performance by the write head, and a controller that selects and performs a first recording mode and a second recording mode different from the first recording mode, and selects and performs one of the first recording mode and the second recording mode according to an assist effect of the assist element.”

The patent application was filed on 2022-02-17 (17/674425).

Disk device with damping member of shaft for multi-actuator assemblies
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11727956) developed by Okamoto; Makoto, and Kido; Takuma, Tokyo, Japan, for a “disk device with damping member of shaft for multi-actuator assemblies.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A disk device includes one or more disks, a base shaft, a bearing shaft, first and second bearing units, first and second actuator assemblies, and a damping member. The bearing shaft has a tubular portion fixed around the base shaft. The first and second bearing units are attached around the bearing shaft and aligned in an axial direction of the bearing shaft. The first and second actuator assemblies are coupled to the first and second bearing units, respectively. The damping member is provided between an outer circumferential surface of the base shaft and an inner circumferential surface of the tubular portion of the bearing shaft.”

The patent application was filed on 2022-02-10 (17/669029).

Magnetic disk device that corrects position of head by demodulation
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11694720) developed by Okamoto; Makoto, and Kido; Takuma, Tokyo, Japan, for a “magnetic disk device that corrects position of head by demodulation.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a disk including a zone servo boundary area including a first area of a first servo frequency, a second area of a second servo frequency, and a third area of the first servo frequency, in a servo area, a head, and a controller demodulating first servo data of the first area to derive a position of the head and demodulating first corrected data of the third area to correct the position of the head. The first area, the second area, and the third area are aligned in order in a traveling direction. The first area and the second area are adjacent to each other in a circumferential direction of the disk. The second area and the third area are adjacent to each other in the circumferential direction.”

The patent application was filed on 2022-08-10 (17/885310).

Disk device having control board closing hole in housing of disk device and communication antenna located inside control board
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11688429) developed by Okano; Taichi, Liu; Jia, Yamamoto; Nobuhiro, Yokohama Kanagawa, Japan, and Tokuda; Kota, Fujisawa Kanagawa, Japan, for a “disk device having a control board closing a hole in a housing of the disk device and a communication antenna located inside the control board.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a disk device includes a housing including a hole, a magnetic disk, a control board closing the hole, and an electronic component. The electronic component is mounted on the control board, and assists a control operation for recording and reproducing information on and from the magnetic disk.”

The patent application was filed on 2021-03-10 (17/197873).

Magnetic disk device
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11682430) developed by Yoshida; Osamu, Kanagawa, Japan, and Nitta; Tatsuo, Tokyo, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to control read/write of the magnetic heads. Each of the plurality of magnetic disks includes a first storage section storing therein control information concerning read/write of the magnetic head. The control section switches the first storage section which is a storage destination of first information that is at least a part of the control information from the magnetic disk to another magnetic disk.”

The patent application was filed on 2021-09-13 (17/473596).

Magnetic disk device and method
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11670330) developed by Kimura; Naoki, Tokyo, Japan, Kudo; Fumiya, Kamakura Kanagawa, Japan, and Abe; Takao, MuYokohama Kanagawa, Japan, for “magnetic disk device and method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a first storage area and a second storage area in which a plurality of tracks are set are provided in a radial direction of a magnetic disk. A plurality of post codes corresponding to the second storage area is stored in the first storage area. A controller controls first processing of reading a plurality of post codes from the first storage area and writing the plurality of read post codes in servo area of the second storage area. In the first processing, the controller controls both second processing and third processing in a state where a write head is located on a first track. The second processing is processing of writing a post code among the plurality of read post codes in a servo area. The third processing is processing of writing user data in a data area or reading user data from a data area.”

The patent application was filed on 2021-09-10 (17/472049).

Magnetic disk device
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11670331) developed by Kimura; Kaori, Yokohama Kanagawa, Japan, Takeo; Akihiko, Tokyo, Japan, and Matsumoto; Takuya, Kawasaki Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium, a magnetic head including a write head having a main magnetic pole that applies a recording magnetic field to the recording medium, an assist element that assists magnetic recording by the main magnetic pole, and a plurality of thermal actuators that control a head gradient with respect to the recording medium, and a controller which includes a detection unit configured to detect deterioration of the magnetic head, and changes a head gradient of the magnetic head by the thermal actuator according to the detected deterioration.”

The patent application was filed on 2022-02-15 (17/672016).

Magnetic disk device and method of write processing of postcode
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11657834) developed by Tagami; Noaki, Yokohama Kanagawa, Japan, for “magnetic disk device and method of write processing of postcode.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a disk including a first region with a first format efficiency and a second region with a second format efficiency lower than the first format efficiency, a head that writes data to the disk and reads data from the disk, and a controller that selects a first postcode to be written to the first region from a plurality of postcodes with different lengths and writes the first postcode to the first region, and selects a second postcode to be written to the second region from a plurality of postcodes with different lengths and writes the second postcode to the second region.”

The patent application was filed on 2021-09-07 (17/468413).

Magnetic disk device with magnetic head size arrangement
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11651782) developed by Isokawa; Hiroshi, Kanagawa, Japan, for a “magnetic disk device with magnetic head size arrangement.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, among a plurality of magnetic heads, the larger the magnetic pole width of the magnetic pole of the magnetic head in the width direction of a recording track formed in a recording layer or the larger an area width of the magnetic head capable of reading the magnetic characteristics of an area of the recording layer on which magnetic recording has been carried out by means of the magnetic head, the farther is the magnetic head arranged outwardly from the vicinity of the center in the parallel arrangement direction of the magnetic disks.”

The patent application was filed on 2021-02-05 (17/168639).

Magnetic disk device and refresh threshold setting method
Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11646051) developed by Isokawa; Hiroshi, and Maeto; Nobuhiro, Yokohama Kanagawa, Japan, for “magnetic disk device and refresh threshold setting method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a disk that includes a first track, a head that includes a heater, writes data to the disk, and reads data from the disk, and a controller configured to set a variation of a parameter related to a write process for the disk within one round of the first track to suppress a variation of an evaluation index corresponding to a write/read processing characteristic within one round of the first track.”

The patent application was filed on 2022-02-03 (17/591957).