Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Assigned Twelve Patents

Disk device having multi-actuator assembly with protective member attached to tip of actuator arm
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11527262) developed by Okamoto, Makoto, Tokyo, Japan, for a “disk device having a multi-actuator assembly with a protective member attached to the tip of an actuator arm.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A disk device includes a plurality of magnetic disks, a plurality of magnetic heads, a first actuator assembly having a plurality of arms and a plurality of suspension assemblies for the magnetic heads and supported to be rotatable about a support shaft, a second actuator assembly having a plurality of arms and a plurality of suspension assemblies for the magnetic heads and supported to be rotatable about the support shaft, and a protective member formed from a material different from a material for the arms. The protective member is provided on a tip end portion of at least one of a first arm closest to the second actuator assembly among the of arms in the first actuator assembly and a second arm closest to the first actuator assembly among the arms in the second actuator assembly.”

The patent application was filed on 2021-08-20 (17/407480).

Hard disk drive having dual micro-actuators carriage arms
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11521646) developed by Miyamoto, Koichiro, Oozeki, Kenichiro, Yokohama Kanagawa, Japan, and Chen, Yu, Sagamihara Kanagawa, Japan, for a “hard disk drive having dual micro-actuators on carriage arms.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, there is provided a hard disk drive including a first recording surface, a second recording surface, a first magnetic head, a first actuator and a second actuator that move the first magnetic head, a second magnetic head, a third actuator and a fourth actuator that move the second magnetic head, a fifth actuator that moves the second actuator and the fourth actuator, a drive circuit that implements at least one of a first mode in which the second actuator and the fourth actuator operate differently from each other or a second mode in which the first and third actuators operate differently from each other, and a controller that controls the drive circuit.”

The patent application was filed on 2021-04-07 (17/224725).

Magnetic disk and manufacturing method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11521647) developed by Ogawa, Takuya, Machida Tokyo, Japan, Kouhara, Shinichirou, Hino Tokyo, Japan, and Tsukahara, Wataru, Yokohama Kanagawa, Japan, for “magnetic disk device and manufacturing method thereof.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A controller for a magnetic disk device acquires a reproduction signal of servo burst data while moving a magnetic head along data tracks that intersect servo tracks at a plurality of points. The controller acquires correction values for correcting repeatable runout on a per servo sector basis based on the reproduction signal. The correction values include a first correction value, which is a correction value for a servo sector at a position where the data track and the servo track are substantially parallel to each other and a second correction value, which is a correction value fora servo sector at a position where the data track and the servo track are not substantially parallel to each other. The controller adjusts the first correction value based on the second correction value, and writes the correction values including the adjusted first correction value onto a magnetic disk.”

The patent application was filed on 2021-08-30 (17/461859).

Magnetic disk and method of compensating for harmonic corresponding to harmonic disturbance
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11508404) developed by Kawabe, Takayuki, Sagamihara Kanagawa, Japan, and Hara, Takeyori, Kawasaki Kanagawa, Japan, for “magnetic disk device and method of compensating for harmonic corresponding to harmonic disturbance.”

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, an actuator that is rotationally driven and controls movement of the head mounted on the disk, and a controller that estimates a fundamental frequency of a position error signal generated in positioning control of the head, the fundamental frequency corresponding to a disturbance having harmonics, determines the fundamental frequency, determines the number of delay samples based on the fundamental frequency, and suppresses a multiplied frequency that is a harmonic of the fundamental frequency according to the number of the delay samples.”

The patent application was filed on 2022-01-20 (17/580506).

Magnetic disk and reordering process
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11507315) developed by Sudo, Daisuke, Yokohama Kanagawa, Japan, for “magnetic disk device and method of reordering process.”

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 first disk, a second disk, a first head, a second head, a first actuator including the first head, a second actuator including the second head, a first arithmetic unit executing a first reordering process of a command stored in a first queue corresponding to the first actuator, and a second arithmetic unit executing a second reordering process of a command stored in a second queue corresponding to the second actuator, the first arithmetic unit executing the second reordering process, the second arithmetic unit executing the first reordering process.”

The patent application was filed on 2020-08-27 (17/004281).

Magnetic disk and write processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11508409) developed by Tomoda, Yusuke, Kawasaki Kanagawa, Japan, for “magnetic disk device and write 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 normal recording region written in a normal recording and a shingled recording region written in a shingled recording, a head including a write head and a plurality of read heads, the head moving on the disk by rotation about a rotation axis, and a controller which selects and executes the normal recording and the shingled recording, wherein a first minimum value of a cross track interval in the radial direction of the disk between two read heads in the plurality of read heads in the normal recording region is smaller than a first maximum value of the cross track interval in the shingled recording region.”

The patent application was filed on 2021-08-20 (17/408143).

Magnetic disk with recording head including spin torque oscillator
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11508400) developed by Matsumoto, Takuya, Kawasaki Kanagawa, Japan, for a “magnetic disk device with recording head including spin torque oscillator.”

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 recording medium, a recording head including a main magnetic pole, a write shield magnetic pole, a coil, and a spin torque oscillator provided between the main magnetic pole and the write shield magnetic pole and a controller including a record current supply circuit and a drive current supply circuit. The controller executes a process of monitoring variation of a resistance value of the spin torque oscillator while increasing the record current in a in which the spin torque oscillator is energized and detecting a record current value when the resistance value is increased most largely, and a process of setting the detected record current value to a lower limit of the record current supplied to the coil.”

The patent application was filed on 2021-08-18 (17/405911).

Magnetic disk and read/write processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11508399) developed by Maeto, Nobuhiro, Yokohama Kanagawa, Japan, for “magnetic disk device and read/write 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, and a controller setting a rewrite threshold value for executing a rewrite process of different tracks in a first sector group including at least one first sector continuous from a first parity sector in which error correction processing in units of tracks is executable based on the first parity sector and including the first parity sector, and a second sector group including at least one second sector continuous in which the error correction processing in units of tracks is unexecutable, and rewriting the first sector group and the second sector group with different frequencies.”

The patent application was filed on 2021-08-20 (17/407893).

Magnetic disk and control method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11508398) developed by Shibasaki, Takeshi, Kamakura Kanagawa, Japan, for “magnetic disk device and control method for 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 head and a controller. The head writes data to the magnetic disk and reads data from the magnetic disk. The controller once reads the data written to a predetermined recording area according to the number of writes of data to the predetermined recording area of the magnetic disk and rewrites the read data to the predetermined recording area. The controller adjusts an additive value to the number of writes based on the presence or absence of a defect on the recording surface of the magnetic disk.”

The patent application was filed on 2021-07-27 (17/386214).

Magnetic disk capable of correcting servo demodulation position
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11495261) 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 2021-06-30 (17/364326).

Magnetic disk and setting method of recording region
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11495263) developed by Kobayashi, Daisuke, Yokohama Kanagawa, Japan, for “magnetic disk device and setting method of recording region.”

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 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.”

The patent application was filed on 2021-03-10 (17/197189).

Manufacturing magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11495255) developed by Kudo, Fumiya, Kanakura Kanagawa, Japan, for a “method for manufacturing magnetic disk device.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a method for manufacturing a magnetic disk device includes: moving a magnetic head such that a read head is located on a first learning position among a plurality of learning positions set in a radial direction of a magnetic disk, and learning RRO correction information related to the first learning position using the read head. The method further includes: moving the magnetic head such that the read head is located on a second learning position among the plurality of learning positions, and executing writing of the RRO correction information related to the first learning position using the write head in parallel while learning RRO correction information related to the second learning position using the read head when the read head is located on the second learning position.”

The patent application was filed on 2021-07-28 (17/387232).