Toshiba Assigned Five Patents

Disk device and method of manufacturing
Kabushiki Kaisha Toshiba, Tokyo, Japan, has been assigned a patent (9,779,779) developed by Okamoto, Makoto, Tokyo, Japan, and Sasaki, Yasutaka, Kanagawa, Japan, for a “disk device and method of manufacturing 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 disk-shaped recording medium, a head which processes data on the recording medium, and a housing accommodating the recording medium and the head. The housing includes a base with a side wall, and a cover having a welded portion welded to the side wall by laser welding. The welded portion includes a first welded portion welded to a first region of the side wall and having weld beads with a first shape, and a second welded portion welded to a second region of the side wall and having welded beads with a second shape different from the first shape.“

The patent application was filed on March 15, 2017 (15/459,697).

Write reordering in hybrid disk drive
Kabushiki Kaisha Toshiba, Tokyo, Japan, has been assigned a patent (9,747,043) developed by Zayas, Fernando Anibal, Rangiora, New Zealand, Ehrlich, Richard M., Saratoga, CA, and Dunn, Eric R., Cupertino, CA, for a “write reordering in a hybrid disk drive.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A hybrid drive and associated methods increase the rate at which data are transferred to a nonvolatile storage medium in the hybrid drive. By using a large nonvolatile solid state memory device as cache memory for a magnetic disk drive, a very large number of write commands can be cached and subsequently reordered and executed in an efficient manner. In addition, strategic selection and reordering of only a portion of the write commands stored in the nonvolatile solid state memory device increases efficiency of the reordering process.“

The patent application was filed on December 1, 2015 (14/956,280).

Magnetic disk and data recording
Kabushiki Kaisha Toshiba, Tokyo, Japan, has been assigned a patent (9,728,215) developed by Kanamaru, Masahiro, Kashiwagi, Kazuto, and Hara, Takeyori, Kanagawa, Japan, for a “magnetic disk apparatus and data recording method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk apparatus of one of the embodiments stores read position dependency information on read signal quality of a data region at a first track and measures the read signal quality at a predetermined radial position in a second data region of a second track different from the first track. A positioning error of the second data region is determined based on the read position dependency information and the read signal quality at the predetermined radial position. Data is recorded in a recording target data region in a shingled recording so as to prevent data written in the second data region from being overwritten by data in a recording target data region adjacent to the second data region by using the determined positioning error.“

The patent application was filed on April 1, 2016 (15/088,952).

Disk drive and position correction
Kabushiki Kaisha Toshiba, Tokyo, Japan, has been assigned a patent (9,728,214) developed by Abe, Masakazu, Yokohama Kanagawa, Japan, for a “disk drive and position correction method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A disk drive according to an embodiment includes a disk, a first actuator having a first arm, a second actuator having a second arm, and a head. The head includes a write head and a read head. In addition, the disk drive includes a control unit calculating an amount of shift from an initial value of offset in a radial direction of the disk between the read head and the write head. The control unit controls the second actuator and corrects a position of the head to a position where the shift amount is reduced.“

The patent application was filed on March 3, 2016 (15/059,800).

Disk device and control method
Kabushiki Kaisha Toshiba, Tokyo, Japan, has been assigned a patent (9,727,265) developed by Kawakami, Izumi, Inoue, Hiroaki, Yokohama Kanagawa, Japan, and Mizuno, Akio, Ome Tokyo, Japan, for a “disk device and control method that controls amount of data stored in buffer.“

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 and a second region, a head configured to record write data to the disk, a buffer configured to store the write data up to a first capacity, and a controller configured to obtain a first processing amount based on a time to save the write data to the first region by the head and a second processing amount improved by saving the write data from the buffer to the first region, compare the first processing amount with the second processing amount, and determine whether the write data should be saved to the first region, based on a result of the comparison between the first processing amount and the second processing amount.“

The patent application was filed on September 8, 2015 (14/847,493).