Toshiba and Toshiba Electronic Devices and Storage Assigned Fourteen Patents

Magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,152,029) developed by Nakamura, Daigo, Yokohama 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 magnetic disk device includes a magnetic disk, a magnetic head, and a controller. The magnetic disk has a plurality of tracks. The magnetic head performs reading and writing from and to the magnetic disk. The controller controls write operations to a first region and a second region of the magnetic disk in different manners. The second region is narrower in track pitch than the first region.”

The patent application was filed on September 10, 2020 (17/016,841).

Magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,152,025) developed by Tsuruoka, Masakazu, Kudo, Fumiya, and Abe, Takao, Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to an embodiment, a magnetic disk device includes a magnetic disk including a first storage area and a second storage area different from the first storage area. In the second storage area, both of a first post code that is used to write user data in the first storage area by a first method and a second post code that is used to write user data in the first storage area by a second method are stored in advance. The first method is a method in which one track between two tracks adjacent to each other overlaps a part of the other track between the two tracks. The second method is a method in which two adjacent tracks do not overlap each other.”

The patent application was filed on March 2, 2020 (16/806,208).

Magnetic disk and servo write
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,127,427) developed by Yamashita, Satoshi, Yokohama Kanagawa, Japan, and Aoki, Takahiro, Kawasaki Kanagawa, Japan, for “magnetic disk device and servo write method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a servo write method includes a head and a disk having a plurality of spiral servo patterns which are written radially in a first direction from a first area to a second area other than the first area at velocity that varies between the first area and the second area, the method including moving the head in a second direction opposite to the first direction to read each of the spiral servo patterns, measuring a plurality of time intervals at which each of the spiral servo patterns is read in the first area, and writing a plurality of servo patterns to the first area based on the time intervals.”

The patent application was filed on September 9, 2020 (17/016,091).

Magnetic disk and head position correction
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,127,426) developed by Tagami, Naoki, Yokohama Kanagawa, Japan, for “magnetic disk device and head position 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 including a recording region including a servo sector, a head configured to write data to the disk and read data from the disk, and a controller configured to acquire a plurality of correction data for a repeatable runout of the recording region, the correction data respectively corresponding to a plurality of measurement positions set based on a first linearity error acquired by reading the servo sector, and to correct a position of the head based on the correction data.”

The patent application was filed on July 7, 2020 (16/922,316).

Magnetic disk device configured to write data according to normal recording and modified shingled recording formats
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,120,833) developed by Fukawa, Kiyotaka, Hiratsuka Kanagawa, Japan, for “magnetic disk device configured to write data according to normal recording and modified shingled recording formats.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device includes a disk including a plurality of areas divided in a radial direction, a head, and a controller configured to control the head to write data to a first area including a plurality of tracks that are separated from each other, and a second area including at least two adjacent tracks that partially overlap. A first distance between track centers of said two adjacent tracks in the radial direction is different from a second distance between track centers of another two adjacent tracks in the second area in the radial direction.”

The patent application was filed on July 29, 2020 (16/942,657).

Magnetic disk drive and head adjusting
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,120,822) developed by Ohtake, Masaya, Kanagawa, Japan, and Takeo, Akihiko, Tokyo, Japan, for “magnetic disk drive and head adjusting method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk drive includes first and second disks having respective first and second surfaces, a first head including a first write head that writes data on the first surface at a first recording density, and a first assist element that generates a first energy for increasing a write performance by the first write head, a second head including a second write head that writes data on the second surface at a second recording density, and a second assist element that generates a second energy for increasing a write performance by the second write head, and a controller that changes one of the first and second recording densities based on a first recording capacity up to which the first head is capable of writing on the first disk, a second recording capacity up to which the second head is capable of writing on the second disk, and a target capacity.”

The patent application was filed on August 26, 2020 (17/003,728).

Magnetic disk having first and second assist elements and write operation
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,114,127) developed by Suzuki, Hiroyuki, Kamakura Kanagawa, Japan, and Takeo, Akihiko, Kokubunji Tokyo, Japan, for “magnetic disk device having first and second assist elements and write operation 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 main magnetic pole, a write shield that faces the main magnetic pole in a first direction and is separated from the main magnetic pole by a gap, a first assist element that is disposed in the gap and a second assist element that is disposed in the gap and is positioned relative to the first assist element in a second direction intersecting the first direction, and a controller configured to: cause a first assist energy from the first assist element to be applied to the disk and affect a coercive force of the disk, and cause a second assist energy from the second assist element to be applied to the disk and affect a coercive force of the disk, wherein the first assist energy is different from the second assist energy.”

The patent application was filed on March 2, 2020 (16/806,585).

Disc with head placement responsive to shock detection
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,114,125) developed by Yamane, Masami, Kawasaki Kanagawa, Japan, for a “disc device with head placement responsive to shock detection.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a disk device includes a base, a discoidal recording medium including an innermost circumferential portion and an outer circumferential edge, a head, a head actuator provided pivotably on the base and supporting the head movably, a first sensor which detects a shock and a drive unit which pivots, when the shock detected by the first sensor is greater than a predetermined value and the head is located at a position less than a predetermined distance from the innermost circumferential portion, the head actuator to place the head at a position more than the predetermined distance which satisfies a conditional formula below. .times..times. ##EQU00001##.”

The patent application was filed on August 20, 2020 (16/998,091).

Magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,114,124) developed by Takeda, Yoshihiko, 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 control device to be used for a magnetic disk device includes a power source control section and a control section. The power source control section configured to change an output voltage value of a voltage supplied to the control device from a power source on the basis of a voltage control parameter. The control section configured to, when a magnetic head makes access to a zone set on a magnetic disk, set a voltage control parameter provided in such a manner as to be correspondent to the zone to the power source control section.”

The patent application was filed on September 6, 2019 (16/562,980).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,114,118) developed by Akatsuka, Naoto, 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 first actuator assembly and a second actuator assembly which are respectively supported by a first bearing unit and a second bearing unit to be rotatable about a support shaft. The first bearing unit includes a first sleeve and a ball bearing. The second bearing unit includes a second sleeve and a ball bearing. The first sleeve includes a first end surface opposed to the second sleeve and an annular first step projecting from the first end surface, and the second sleeve includes a second end surface opposed to the first step with a gap and an annular second step projecting from the second end surface. The second step is opposed to the first step and the first end surface with a gap.”

The patent application was filed on July 23, 2020 (16/936,907).

Magnetic disk and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,107,500) developed by Fukuta, Kazuo, Yokohama 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 magnetic disk device includes a magnetic disk, a magnetic head, a sensor, a non-volatile semiconductor storage device, and a controller. The magnetic head performs writing and reading to and from the magnetic disk. The sensor detects a degree of a physical influence applied from an outside. The controller generates a log when a detection value detected by the sensor satisfies a condition for abnormality determination, and stores the log in the non-volatile semiconductor storage device in response to generation of the log.”

The patent application was filed on March 12, 2020 (16/816,735).

Magnetic disk and servo gate generation
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,100,947) developed by Tagami, Naoki, 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 magnetic disk device includes a disk including a servo sector including burst data, a head including a write head which writes data to the disk, and a read head which reads data from the disk, and a controller which generates a first normal servo gate for applying servo read to the servo sector, wherein when a short servo gate for at least applying servo read to the burst data is generated, the controller generates the short servo gate and the first normal servo gate, and when the short servo gate is not generated, the controller generates the first normal servo gate and a second normal servo gate different from the first normal servo gate.”

The patent application was filed on September 2, 2020 (17/009,913).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,094,342) developed by Asakura, Makoto, Bunkyo Tokyo, Japan, and Tagami, Naoki, 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, in a disk device, a first pattern cut out from a burst region at a certain servo track by a first length and with a first start position, does not match a second pattern cut out from the burst region at an adjacent servo track by the first length and with an arbitrary second start position including first timing. The burst region at the servo tracks includes a first burst pattern including a first magnetized portion where a first value is recorded and a second magnetized portion where a second value reverse to the first value in polarity is recorded, the second magnetized portion being adjacent to the first magnetized portion in a down track direction. A width of the first magnetized portion in the down track direction and a width of the second magnetized portion in the down track direction are different from each other.”

The patent application was filed on July 2, 2020 (16/919,327).

Magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11,094,341) developed by Matsuzawa, Takuji, Kashiwa Chiba, 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, a first actuator that moves the magnetic head to a predetermined position on the magnetic disk, a second actuator that is provided in the first actuator and adjusts a position of the magnetic head, a control unit that controls operations of the first actuator and the second actuator, and a storing unit that stores a coefficient of an approximation polynomial calculated based on an approximation formula for approximating voltage dependency of a gain of the second actuator. When controlling the operation of the second actuator, the control unit calculates the gain amplitude of the second actuator from the approximation polynomial in which the coefficient is used and amplitude of a voltage input to the second actuator.”

The patent application was filed on July 22, 2020 (16/935,494).