Fujitsu Corporation

Toshiba Storage Device Corporation

Kenrou Yamamoto

Takahiro Imamura

Yoshiharu Kasamatsu

Masaki Kameyama

Toru Yokohata

Masaharu Sugimoto

Susumu Yoshida

Kazuhiro Watanabe

Hiroyuki Hyodo

A method of estimating life of a head that reads information recorded in a recording medium includes detecting magnitude of an impact due to a contact between the head and the recording medium; and estimating the life of the head based on the magnitude of the impact detected.

Method of estimating life of head, method of inspecting recording medium, method of evaluating head, and information recording/reproducing apparatus

A slider body of a head slider has a medium-opposed surface opposed to a recording medium in a recording medium drive. A head element is mounted on the slider body. A charge region is established on the slider body for holding an electric charge at a local area in the medium-opposed surface of the slider body. The charge region is located at a position distanced from the head element. Capacitance is stored between the head slider and the recording medium. The capacitance serves to determine the distance between the head slider and the recording medium. In this case, electric potential concentrates at the charge region, so that electrospark concentrates at the charge region. The head element can be distanced from the electrospark. The head element can thus be prevented from destruction.

Recording medium drive including electrostatic actuator between head slider and recording medium

A magnetic head slider disposed opposite to a surface of a magnetic disk, includes a slider main body, a magnetic head element that reads and reproduces data from the magnetic disk, and a vibration absorbing unit that absorbs vibrations generated due to contact between any portion of the slider main body and the surface of the magnetic disk, and that is provided on the slider main body at a predetermined position.

Magnetic head slider for absorbing vibrations

A method of manufacturing a magneto-resistance effect type head that includes an element portion of magneto-resistance effect type and reproduces a read signal of data from a recording medium by the element portion, is proposed. The method includes applying a predetermined DC current to the element portion; and performing heat treatment on a part of the element portion that has been thermally deformed due to application of the DC current.

Method of manufacturing magneto-resistance effect type head

A DC current is supplied to the write coil of a GMR headequipped with a completed HGA (Head Gimbal Assembly). The element part of the GMR headis thereby thermally deformed. Thus deformed, the element part protrudes, abutting on a rotating laser-bump disk, above which the HGA is floating. When the element part abuts on the disk, a magnetic field (2470 gauss) that extends in a direction opposite to the magnetization direction of the fixed layer of the GMR headis applied to the top of a core slider

Apparatus and method for evaluating magnetic heads, and disk for use in evaluating magnetic heads

A protector protuberance is formed on a head slider incorporated in a recording medium drive such as a hard disk drive. The protector protuberance is allowed to collide against a contamination on a recording medium in front of a head element mounted on the head slider. The head element can be protected from collision against the contamination behind the protector protuberance. The protector protuberance is located as close to the head element as possible. Even with a smaller protector protuberance, the front and rear support protrusions contact the recording medium so as to hold the slider body above the surface of the recording medium. An increase can be prevented in the adsorption acting between the slider body and a lubricant agent spreading over the surface of the recording medium. A smaller protector protuberance enables the head element to approach the recording medium as close as possible upon read/write operations.

Head slider having protector protuberance in front of head element

A protection film is layered over the trailing or outflow end surface of a slider body in a head slider for a recording medium drive. A head element is embedded within the protection film. The head element generates heat in response to the supply of an electric current. The heat causes thermal expansion of the protection film. The tip end of the head element thus excessively approaches the recording disk beyond the medium-opposed surface of the head slider. The flying height of a protection protuberance is set smaller than a flying height of the head element even when the protection film suffers from thermal expansion. The protection protuberance is allowed to trace an orbit closer to the recording medium than the orbit of the head element. The protection protuberance is allowed to collide against obstacles on the recording medium in front of the head element.

Recording medium drive including head slider having protection protuberance standing on air bearing surface

A medium substrate comprising a borosilicate glass containing silica as a main component and having on the surface thereof a continuous texture derived from the porous structure, the medium substrate being used as a substrate in the production of a magnetic recording medium and other. The method for the production of the textured medium substrate is also disclosed, along with a magnetic recording medium using the medium substrate and a magnetic disk device.

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Kawasaki, Japan

Kenrou Yamamoto