Toshiba and Toshiba Electronic Devices & Storage Assigned Eighteen Patents

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,410,695) developed by Yamane, Masami, Kawasaki Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device includes a plurality of magnetic disks, a plurality of sliders each including one or more resistive elements, each of which is arranged to face a recording surface of one of the plurality of magnetic disks, and is provided corresponding to the plurality of magnetic disks, and a processor configured to detect a change in a resistance value of one or more of the plurality resistive elements.”

The patent application was filed on August 20, 2021 (17/407,471).

Magnetic disk device and error correction processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,404,085) developed by Ohtsubo, Jun, Odawara Kanagawa, Japan, for “magnetic disk device and error correction processing 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 including a first track including a first parity sector and a second track including a second parity sector, a head that writes data to the disk and reads data from the disk, and a controller that writes, to the first parity sector, a third parity sector obtained by XORing a first sector group included in each of the first track and the second track, and writes, to the second parity sector, a fourth parity sector obtained by XORing a second sector group different from the first sector group, included in each of the first track and the second track.”

The patent application was filed on August 11, 2021 (17/399,524).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,404,084) developed by Koizumi, Gaku, 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 magnetic disk, a magnetic head configured to write data on the magnetic disk, an assist section configured to assist, when the magnetic head writes data on the magnetic disk, write of the data by utilizing an assist element, a voltage control section configured to control a voltage to be applied to the assist element, and a positioning control section configured to carry out positioning of the magnetic head relatively to the magnetic disk on the basis of servo data and acquire positional error data of the magnetic head positioned on the basis of the servo data. The voltage control section adjusts the voltage to be applied to the assist element on the basis of the positional error data.”

The patent application was filed on January 29, 2021 (17/162,211).

Magnetic disk device and track setting
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,393,500) developed by Kashiwagi, Kazuto, Ishiguro, Bunpei, and Shimomura, Kazuhito, Yokohama Kanagawa, Japan, for “magnetic disk device and track 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, a head, and a controller that sets at least a set of a first target position and a second target position to be matched, among a plurality of the first target positions respectively corresponding to a plurality of first tracks in a case where writing on the first tracks is performed to the first region of the disk in a radial direction of the disk under a first recording mode, and a plurality of the second target positions respectively corresponding to a plurality of second tracks in a case where writing on the second tracks is performed to the first region in the radial direction under a second recording mode different from the first recording mode.”

The patent application was filed on August 11, 2021 (17/399,541).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,386,923) developed by Uehara, Manabu, Kanagawa, Japan, for a “disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a disk device includes two magnetic disks opposing each other at intervals of 1.2 to 1.5 mm, and at least two suspension assemblies movable respectively between the two magnetic disks. Each of the suspension assemblies includes a base plate, a load beam extending from the base plate, a tab extending from a distal end of the load beam, a wiring member on the load beam and the base plate, including a gimbal portion, and a magnetic head on the gimbal portion, abutting on a dimple of the load beam via the gimbal portion. The ratio of a distance from a bendable location of the load beam to a center of the dimple with respect to a distance from the center of the dimple to a tip of the tab is 2.8 to 3.8.”

The patent application was filed on February 17, 2021 (17/177,549).

Magnetic disk apparatus and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,373,684) developed by Kubota, Yusuke, Kawasaki Kanagawa, Japan, and Oyabu, Hiroshi, Chigasaki Kanagawa, Japan, for “magnetic disk apparatus and method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk apparatus includes a magnetic disk, a magnetic head, and a controller. The magnetic disk includes a plurality of tracks. The magnetic head performs read/write from/to the plurality of tracks. The controller controls, in a first case in which, during execution of write to a first track among the plurality of tracks, a position of the magnetic head is displaced from a target position corresponding to the first track toward a second track, and a first distance exceeds a first threshold, write to the second track under a condition different from a condition in a second case in which the first distance is less than the first threshold. The second track is a track different from the first track among the plurality of tracks. The first distance is the distance between the target position and the position of the magnetic head.”

The patent application was filed on March 10, 2021 (17/198,069).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,355,152) developed by Ozeki, Kenichiro, Kanagawa, Japan, Chen, Yu, and Miyamoto, Koichiro, Kanagawa, Japan, for a “disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a disk device includes a recording medium, a suspension, a magnetic head, an actuator, a circuit board, an FPC, a preamplifier, and an actuator driver. The magnetic head and the actuator are mounted on the suspension. The circuit board includes a control circuit. The FPC is connected to the suspension and the circuit board. The preamplifier is mounted on the FPC, outputs a write signal, to the magnetic head, corresponding to information to be written to the recording medium by the magnetic head, and receives, from the magnetic head, a read signal corresponding to information read from the recording medium by the magnetic head. The actuator driver is mounted apart from the preamplifier on the FPC, the actuator driver that outputs a drive signal for driving the actuator to the actuator.”

The patent application was filed on March 8, 2021 (17/195,181).

Magnetic disk device capable of correcting servo demodulation position
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,355,151) developed by Tagami, Naoki, Yokohama Kanagawa, Japan, for a “magnetic disk device capable of correcting servo demodulation position.“

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 two first servo sectors and at least a second servo sector, a head, and a controller, wherein the first servo sector includes burst data and a first data pattern written before the circumferential direction of the burst data, the second servo sector includes the burst data, the first data pattern, and a second data pattern written after the circumferential direction of the burst data, a first frequency of the first data pattern is different from a second frequency of the second data pattern, and a first length of the first data pattern is different from a second length of the second data pattern.”

The patent application was filed on June 30, 2021 (17/364,465).

Magnetic disk device and method of setting data format
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,354,042) developed by Isokawa, Hiroshi, Yokohama Kanagawa, Japan, for “magnetic disk device and method of setting data format.“

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 into the disk, and an assist element that generates energy for improving write performance of the write head, and a controller that adjusts a degauss condition after a stop of a write process of the write head, based on a resistance value of the assist element, and adjusts a data format of the disk in accordance with the degauss condition, the resistance value being measured after data is written into the disk, and the write process having an influence on the resistance value.”

The patent application was filed on February 19, 2021 (17/179,724).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,348,602) developed by Kawamitsu, Yuki, Yokohama 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 includes a disk, first and second heads which write data to the disk and read data from the disk, a first actuator includes the first head, a second actuator includes the second head, first and second controllers which control the first head, the second head, the first actuator and the second actuator, an auxiliary power supply which supplies power when power from a power supply is shut off, and a power supply detection unit which makes power supplied from the auxiliary power supply to the first controller higher than the power supplied from the auxiliary power supply to the second controller when shutoff of power from the power supply is detected.”

The patent application was filed on June 30, 2021 (17/364,302).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,342,650) developed by Liu, Jia, Okano, Taichi, Yokohama Kanagawa, Japan, Tokuda, Kota, Fujisawa Kanagawa, Japan, and Yamamoto, Nobuhiro, Yokohama Kanagawa, Japan, for a “disk device.“

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 sidewall, a magnetic disk, a wireless communication device including a first communication antenna, and a first insulating member. The sidewall includes a first through portion. The first insulating member closes the first through portion. The first communication antenna is located in the first through portion, is disposed spaced from the housing, and wirelessly communicates with an outside of the housing.”

The patent application was filed on March 10, 2021 (17/197,722).

Disk device with damper attached to arm of actuator assembly
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,341,997) developed by Tokizaki, Tomoyuki, Yokohama Kanagawa, Japan, for a “disk device with damper attached to arm of actuator assembly.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a disk device includes a plurality of recording media each including a recording layer and an actuator assembly including an actuator block rotatably supported around a rotation shaft, a plurality of arms extending from the actuator block, and suspension assemblies respectively attached to the arms and supporting respective magnetic heads. Of the plurality of arms, at least one arm has vibration characteristics different from those of the other arms.”

The patent application was filed on February 19, 2021 (17/180,533).

Disk device with magnetic head
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,341,991) developed by Okada, Mio, Yokohama Kanagawa, Japan, Watanabe, Toru, and Yamane, Masami, Kawasaki Kanagawa, Japan, for a “disk device with magnetic head.“

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, a temperature sensor in the housing, a magnetic disk in the housing, a magnetic head disposed in the housing to be movable in a radial direction of the magnetic disk, the magnetic head including a write head, a read head, a first thermal actuator, and a second thermal actuator, a power supply circuit which supplies first power to the first thermal actuator and supplies second power to the second thermal actuator, and a controller configured to adjust a power ratio between the first power and the second power, based on at least one of a change in temperature inside the housing and a change in a radial position of the magnetic head in the radial direction.”

The patent application was filed on July 16, 2021 (17/377,920).

Magnetic disk device and error correction
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,335,375) developed by Maeto, Nobuhiro, Yokohama Kanagawa, Japan, for “magnetic disk device and error correction 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, a head that writes data to the disk and reads data from the disk, and a controller that executes error correction on a first sector which is unreadable in a first track from an initial reading time of initially one-round reading the first track of the disk based on first parity data corresponding to the first track.”

The patent application was filed on February 8, 2021 (17/170,052).

Magnetic disk device and sector processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,335,374) developed by Fujimoto, Kazumi, Odawara Kanagawa, Japan, and Furuhashi, Takao, Kawasaki Kanagawa, Japan, for “magnetic disk device and sector processing 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 having a first sector including first servo data, first user data, and first correction information used to correct a data error, a head that writes data to the disk and that reads data from the disk, and a controller that changes, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction.”

The patent application was filed on February 19, 2021 (17/179,626).

Magnetic disk device and read processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,335,366) developed by Kawabe, Takayuki, Sagamihara Kanagawa, Japan, and Sudo, Daisuke, Kawasaki Kanagawa, Japan, for “magnetic disk device and read processing 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 including a first sector arranged at a first radial position deviated from a target position in a radial direction by a first offset amount larger than a first threshold value, a head that writes data to the disk and reads data from the disk, and a controller that reads the first sector by arranging the head at a second radial position deviated from the target position by a second offset amount different from the first offset amount.”

The patent application was filed on February 24, 2021 (17/183,529).

Magnetic disk device and read processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,322,181) developed by Maeto, Nobuhiro, Yokohama Kanagawa, Japan, for “magnetic disk device and read processing 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, a head including a write head and a first read head and a second read head, and a controller that disposes the first read head at a first radial position of a first track of the disk in a radial direction to read the first track, changes a main read head which serves as a reference for positioning during a read process from the first read head to the second read head when read retrying the first track, disposes the second read head as the main read head at a second radial position different from the first radial position of the first track in the radial direction to read the first track, and changes an internal setting corresponding to the main read head to read the first track.”

The patent application was filed on February 12, 2021 (17/174,459).

Disk device with magnetic recording media and improved impact resistance
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,308,980) developed by Okada, Mio, Kanagawa, Japan, for “disk device with magnetic recording media and improved impact resistance.“

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, a plurality of magnetic recording media disposed in the housing in a multi-layered manner with intervals therebetween and a plurality of spacer rings, one of the spacer rings being disposed between each adjacent pair of the magnetic recording media. At least one of an uppermost magnetic recording medium and a lowermost magnetic recording medium includes a substrate having a rigidity higher than that of substrates of the other magnetic recording media, and one or more of the plurality of spacer rings is in contact with the magnetic recording media including the substrate having the higher rigidity, and has a thermal expansion coefficient different from a thermal expansion coefficient of the other spacer rings.”

The patent application was filed on March 3, 2021 (17/190,791).