Fujitsu Corporation

Yasumasa Kuroba

Tomoyoshi Yamada

Keiji Aruga

Shinji Koganezawa

Yoshifumi Mizoshita

Takao Sugawara

Hiroyuki Mase

Masaru Matsumoto

Toru Kouhei

Masao Tsunekewa

Toru Kohei

Kazuhiko Takaishi

Mitsuo Kamimura

Mitsuaki Yoshida

Hiroyuki Iwahara

Masao Tsunekawa

Tohru Kouhei

A method of STW (servo track write) for improving the quality of the servo tracks by suppressing the misalignment of the write start position caused by the asynchronous continuous vibration of a disk drive is disclosed. The disk drive includes a spindle motor, a disk medium, a write/read head and a head moving mechanism for carrying out the sector servo operation. The STW method comprises the steps of detecting the continuous vibration asynchronous with the rotational frequency of the spindle motor, detecting the phase of the asynchronous continuous vibration detected, determining the write start sector of each servo track based on the detected phase of the asynchronous continuous vibration, determining the write start time of each servo track in accordance with the clock signal, and moving the head onto the servo track where the head positioning information is written, by the head moving mechanism and writing the information in the servo track based on the write start time.

Method of writing servo tracks for disk file apparatus using write start or stop sectors

This invention relates to a head position control method for a disk device that uses a disk medium whose tracks have been formatted externally, and a disk device that effectively uses the range of motion of an actuator. In a disk device that has a disk medium, a head, an actuator, a control circuit, there is a conversion mechanism that sets a data area in the writing range of the disk that corresponds to the range of motion of the actuator, and converts a logical address to a physical address in the data area. This invention makes it possible to set a storage capacity that makes maximum use of the range of motion of the actuator for any device, even when there is a position offset in the range of motion of the actuator.

Head position control method for a disk device and the disk device

Each arm module includes plate-shaped arms which lie on top of each other. A head slider is supported by the extending end of each arm module and faces a data recording surface of a magnetic disk. An actuator drives each arm module. Each arm module has a structure in which the plate-shaped arms which lie on top of each other are integrated with each other.

Disk drive and head suspension unit

A method for incorporating a disk medium into a magnetic disk drive, in which the rotation center of the disk medium when a servo track information is written onto the disk medium (STW) coincides with the rotation center thereof when the disk medium is incorporated into the disk apparatus. A reference marker is provided as a positioning reference on a part of the disk medium. The disk medium is incorporated into a STW apparatus so that STW is performed on the disk medium. The disk medium is also incorporated into the magnetic disk drive in such a manner that a distance from an axis of rotation center of the disk medium to the reference marker is the same as when the STW was performed onto the disk medium.

Method for incorporating disk media into magnetic disk drive

A compact card type disk drive includes a housing (21) for accommodating a disk for storing data, a disk drive for rotating the disk, a head assembly for writing and reading data to and from the disk and an electronic circuit including at least an interface circuit (39), the latter three being accommodated in the housing. A connector (42) connected to the electronic circuit is fixed to the outside portion of the housing (21). The electronic circuit preferably contains a read/write circuit (36) and a control circuit (38). The housing (21) preferably includes a lower base (22) and an upper cover (23), and a printed circuit board (14) is disposed along the inner wall of either one, or both, of the base (22) and the cover (23). The outer dimension of the plane of the disk drive is preferably about 85.6 mm.times.54 mm, and typically, the outer thickness is 5 mm. Preferably, one connector (42) is disposed on either one of the minor sides of the housing (21). The connector (42) is disposed at the substantial center of the housing in the direction of its thickness and is fixed to one of the minor sides of the housing (21) which opposes the head assembly with respect to the disk.

Construction for attaching a disk in a disk drive

A compact card type disk a drive includes a housing (21) for accommodating a disk for storing data, a disk drive for rotating the disk, head assembly for writing and reading data to and from the disk and an electronic circuit including at least an interface circuit (39), the latter three being accommodated in the housing. A connector (42) connected to the electronic circuit is fixed to the outside portion of the housing (21). The electronic circuit preferably contains a read/write circuit (36) and a control circuit (38). The housing (21) preferably includes a lower base (22) and an upper cover (23), and a printed circuit board (14) is disposed along the inner wall of either one, or both, of the base (22) and the cover (23). The outer dimension of the plane of the disk drive is preferably about 85.6 mm.times.54 mm, and typically, the outer thickness is 5 mm. Preferably, one connector (42) is disposed on either one of the minor sides of the housing (21). The connector (42) is disposed at the substantial center of the housing in the direction of its thickness and is fixed to one of the minor sides of the housing (21) which opposes the head assembly with respect to the disk.

Shaft construction of a disk drive

A magnetic disk apparatus includes a magnetic disk accommodated for rotation in a housing, a spindle mechanism for driving the magnetic disk to rotate, a magnetic head for writing and reading out information onto and from the magnetic disk, a suspension for supporting the magnetic head thereon, an actuator for driving the suspension in order to move the magnetic head in a radial direction of the magnetic disk, and a retraction mechanism for retracting the magnetic head to a particular area on the magnetic disk when the spindle mechanism is rendered inoperative. The magnetic disk apparatus further includes a mechanism provided at a location above the magnetic disk in an opposing relationship to the particular area of the magnetic disk for pressing at least one of the magnetic head and the suspension against the magnetic disk. In lieu of the pressing mechanism, a displacement restriction member may be provided.

Magnetic disk drive provided with means for pressing head against disk

A compact card type disk drive includes a housing (21) for accommodating a disk for storing data, disk drive for rotating the disk, a head assembly for writing and reading data to and from the disk and an electronic circuit including at least an interface circuit (39), the latter three being accommodated in the housing. A connector (42) connected to the electronic circuit is fixed to the outside portion of the housing (21). The electronic circuit preferably contains a read/write circuit (36) and a control circuit (38). The housing (21) preferably includes a lower base (22) and an upper cover (23), and a printed circuit board (14) is disposed along the inner wall of either one, or both, of the base (22) and the cover (23). The outer dimension of the plane of the disk drive is preferably about 85.6 mm.times.54 mm, and typically, the outer thickness is 5 mm. Preferably, one connector (42) is disposed on either one of the minor sides of the housing (21). The connector (42) is disposed at the substantial center of the housing in the direction of its thickness and is fixed to one of the minor sides of the housing (21) which opposes the head assembly with respect to the disk.

Disk drive having a thickness equal to an IC memory card

A rotary moving coil actuator in a disk drive selectively positions a read/write head with respect to disk medium. A carriage is pivotable about an axis and has a carriage arm for supporting the head. A pair of magnets, disposed in spaced relationship within a magnetic yoke structure, have spaced flat faces perpendicular to the axis and define a gap therebetween. A flat coil structure, comprising one or a pair of flat coils, is attached to the carriage and disposed at least in part within the gap between the opposing flat faces of the magnets so as to be movable along a stroke of movement relatively thereto. The flat coil structure in cooperation with the magnets, generates a driving force in a direction approximately parallel to a first line which is perpendicular to the axis and passes through the axis and toward the read/write head and thereby substantially perpendicular to the seek direction of the head.

Head actuator having reduced and controlled vibration characteristics

A retracting assembly produces a constant torque, in a data zone of a magnetic disk, which is greater than static friction of a bearing for a rotary actuator. However, in a parking zone on an outer portion of the magnetic disk, the retracting assembly generates a torque which suddenly increases so that a large holding torque is obtained and a magnetic head is reliably locked.

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Kawasaki, Japan

Yasumasa Kuroba