Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Masami Yamane

Toru Watanabe

Kan Takahashi

Kazuhiro Furutani

Gaku Koizumi

Mio Okada

Teruyoshi Higashiya

Shinichi Kobatake

According to one embodiment, a disk device includes a rotatable magnetic disk, an actuator which supports and moves a head, a ramp which holds the head at an unloaded position, a motor which rotates the magnetic disk, and a controller which performs a load operation and a seek operation. When a radial travel speed of the head during the load operation is referred to as Vr, a circumferential travel speed of the head is referred to as Vt, a radial travel speed of the head during the seek operation is referred to as Vrs, and a circumferential travel speed is referred to as Vts, the controller controls at least one of the radial travel speed of the head and number of revolutions of the magnetic disk to satisfy a relationship (Vr/Vt)<(Vrs/Vts).

Magnetic disk device

According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, a heater a control section. When making the magnetic head carry out the seek operation from the first position to the second position, the control section starts application of a first voltage to the heater while the seek operation is carried out and, after application of the first voltage, makes the voltage to be applied to the heater a second voltage greater than the first voltage before the magnetic head is positioned to the second position and write of data is started by the magnetic head.

Magnetic disk device and voltage application method of magnetic disk device

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.

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.

Disk device with magnetic head

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. 

Disc device with head placement responsive to shock detection

According to one embodiment, a recording head includes a main pole and a first shield. The first shield includes a distal end portion projecting from an air bearing surface of a slider. The distal end portion includes a distal end surface which includes a first shield edge opposing the main pole with a write gap and a second shield edge spaced apart from the first shield edge in a trailing end side. A distal end portion of the main pole projects from the distal end surface. When a length between the distal end portion of the main pole and the second shield edge is L, the projection amount of the distal end portion of the main pole is h, a flying pitch is D, and a protrusion pitch angle is D, the recording head satisfies a relationship of: L&#x2265;h/(D+D).

Magnetic head and disk device with heat actuators

According to one embodiment, a head gimbal assembly includes a suspension and a magnetic head supported by the suspension via a gimbal portion. The magnetic head includes a slider and a head portion provided in the slider. The slider includes an air bearing surface, a pair of side surfaces, a leading-side end surface, and a trailing-side end surface. The slider includes a deep groove which is formed between the leading-side step portion and the trailing-side step portion and is open to the air bearing surface and the pair of side surfaces, and a pair of partition walls which extends from the trailing-side step portion toward the leading-side step portion along the pair of side surfaces to close at least a portion of a side surface opening of the deep groove.

Head gimbal assembly and magnetic disk device having the same

According to one embodiment, a magnetic head includes a slider with an air bearing surface, and a head element in the slider. The slider includes a leading step at a leading side end of the air bearing surface, a trailing step at a trailing side end of the air bearing surface and including the head element, a deep groove formed between the leading step and the trailing step and opening to the air bearing surface, a center rail extending from a center portion of the air bearing surface to the trailing step, and a pair of pressure generators disposed between the center rail and each side edge.

Magnetic head and magnetic disk device including the same

According to one embodiment, a head gimbal assembly includes a suspension and a magnetic head supported by the suspension via a gimbal portion. The magnetic head includes a slider and a head portion in the slider. The slider includes an air bearing surface, a pair of side surfaces, a leading-side end surface, and a trailing-side end surface. The slider includes a deep groove which is formed between a leading-side step portion and a trailing-side step portion and is open to the air bearing surface and the pair of side surfaces, and at least a pair of capturing grooves which is formed on a bottom surface of the deep groove. The capturing grooves are provided along the pair of side surface and are placed with a gap from the pair of side surfaces.

Head gimbal assembly and magnetic disk device with the same with slider having intermittent capture grooves

According to one embodiment, a head for a disk drive includes a slider including an air-bearing surface having a pair of side edges, a pair of side surfaces, a leading-side end surface and a trailing-side end surface, and a head section provided in the slider. The slider includes a leading step in a leading-side end portion of the air-bearing surface, a deep trench provided downstream side of the leading step, and a trailing step in a trailing side end portion of the air-bearing surface and including the head section built therein, and side trenches having a depth of 100 to 300 nm formed respectively along the pair side edges of the air-bearing surface.

Head and disk drive with the same

According to an embodiment, a slider of a head includes a negative-pressure cavity defined by a recess formed in a disk-facing surface, a leading step portion which is situated on an upstream side of the negative-pressure cavity with respect to an airflow and projects from a bottom surface of the negative-pressure cavity, a trailing step portion which is provided on an outflow-side end portion of the facing surface on the downstream side of the negative-pressure cavity with respect to the airflow, projects from the bottom surface of the negative-pressure cavity, and constitutes a part of the facing surface, and a maximum-positive-pressure producing step portion which is spaced upstream from the trailing step portion with respect to the airflow, projects from the bottom surface of the negative-pressure cavity, and produces a maximum positive pressure. A head portion is provided on the trailing step portion.

Growing community of inventors

Kawasaki Kanagawa, Japan

Masami Yamane