Alps Electric Co., Ltd.

Other

Sony Corporation

Isao Asano

Makito Takikawa

Masao Ohkita

Shoichiro Saito

Hiroki Hirashima

Tatsumaro Yamashita

Kenji Abe

Kyoichi Shirane

Takayuki Sugawara

Hiroshi Yoshida

Tooru Kaneko

Tetsuya Mitsuishi

Toru Kowaguchi

Kouzou Onodera

Masahiro Matsunaga

Kazuhisa Taira

Masao Ohkjita

A disk device for performing error-correction processing is loaded with a high-reliability disk to which a C1 code as a low-level error-correction code (ECC) is added for every sector, and a C2 code as a high-level ECC is added for every plurality of sectors. A host computer includes a device driver corresponding to the high-reliability disk. When data written to the high-reliability disk is read, low-level error-correction is performed based on the C1 code in units of one block corresponding to one sector, and the corrected data is notified to the host computer. Simultaneously, the C2 code along with the data for a plurality of blocks is loaded, and high-level error correction based on the C2 code is thereby performed.

Disk device with improved error-correction capability

The rotational balance by weight of a rotational driving apparatus for a disk is adjusted in a state in which a hub or a dummy member equivalent to the hub is fixed onto a turntable while a motor thereof is driven. When the hub is mounted on the turntable, rotation with excellent weight balance can be achieved, resulting in prevention of vibration due to imbalance of weight.

Rotational driving apparatus for disk and manufacturing method therefor

A disc driving device of the type in which two different head units are moved by a linear motor along the radial direction of two discs having different recording densities. If a floppy disc with the standard recording density (lower order mode) is loaded on a disc table and a shock sensor detects the shock, a controller discontinues the recording and/or reproducing processing by a FDD (Floppy Disk Drive).

Dual head disk drive unit for differing recording densities

When loading an upper head, it is brought into contact with a disc, with a lower head being in contact with the disc. In this process, the entire surface of the upper head which slides on the disc and in which gaps are provided is brought into contact with the disc at a position off the data zone. Further, the upper head is provided with a supported member, and a support member supporting the supported member, whereby the upper head is supported before coming into contact with the disc, and the upper head is gradually brought close to the disc to effect contact.

Magnetic disc device having head control mechanism capable of effecting head contact during high speed medium rotation

Since disks of the same type are loaded in a disk device using a conventional disk changer scheme, the disk device is not versatile as a peripheral device of a computer. ROM disks and RAM disks are mixed and stored in a magazine, and this magazine is loaded in the disk device. In the disk device, a tray is identified in step by a detector arranged on the tray to check whether the tray be a ROM disk or a RAM disk. Thereafter, discrimination information is recorded, together with the contents information, on an IC memory arranged on the magazine in step. Thereafter, when the magazine is loaded again, the discrimination information is read from the IC memory, and an operation corresponding to each disk is performed.

Optical disk discriminating method, including memory storage, for

The invention relates to a recording/playback apparatus, and more particularly to a recording/playback apparatus in which a cam member is provided to retract a transducer from the disk surface. The apparatus comprises a disk, a transducer, a support member for supporting the transducer, and a cam member. The cam member is formed into an arcuate shape in its half portion on the side coming into contact with the support member, and the remaining half portion of the cam member has an upper surface substantially flat.

Low-vibration retraction cam for recording/playback apparatus

A magnetic disk drive device for reading from or writing to a magnetic disk having an actuator assembly composed of a yoke plate, an actuator housing magnetic heads, a stopper for restricting the range of rotation of the actuator, and a solenoid bracket housing an actuator locking mechanism, wherein the actuator assembly is assembled as a single unit for mounting to and removing from the disk drive device.

Disk drive device with unified actuator assembly

A magnetic disk drive device for reading-out/writing-in information on/from a disk which comprises a yoke plate for rotatably supporting an actuator by a pair of bearings; a stopper for restricting the rotation range of said actuator; a solenoid bracket integrated in the yoke plate; a lock mechanism for locking said actuator at the innermost peripheral of the disk; a base plate having a recess for securing the yoke plate; an air filter formed in V-shape to purify air in said case; and a back-tension regulating piece in contact with a flexible print board.

Disk drive including flexible print board and back tension regulating

Disk drive device including a V-shaped air filter

A magnetic disk drive device for reading-out/writing-in information on/from a disk which comprises a yoke plate for rotatably supporting an actuator by a pair of bearings; a stopper for restricting the rotation range of said actuator; a solenoid bracket integrated in the yoke plate; a lock mechanism for locking said actuator at the innermost peripheral of the disk; a base plate in which a recess for securing the yoke plate; an air filter formed in V-shape to purifying air in said case; and a back-tension regulating piece in contact with a flexible print board.

Disk drive with improved structure for fastening bearing assembly to

In a magnetic disk apparatus adapted such that a magnetic disk made of a hard disk type carrier with a magnetic recording region formed on the surface thereof is rotated in a high speed therein, air is introduced between its slider formed integral with a magnetic head and the magnetic disk, whereby the magnetic head is floated over the magnetic disk and allowed to write data on the magnetic recording layer or read data written on the magnetic recording layer, the magnetic disk apparatus is disclosed wherein the angle of obliquity of the main axis of the slider at the innermost circumferential portion of the recording region with respect to the radial direction of the magnetic disk is set to such angle as will bring the floating height of the edge portion of the slider toward the center of the magnetic disk and the floating height of the edge portion thereof toward the outermost circumference are virtually equal to each other.

Floating head slider device for magnetic disk apparatus

An information recording disk driving device includes an information recording disk having servo tracks formed at predetermined regions which include servo information. The driving device is configured to move a head assembly from a recording track for signal writing or reading to an associated one of the servo tracks in response to a servo information supplied at a predetermined time. An instruction from a controller or an instruction from a host computer to read the servo information from the servo track subsequently place the head assembly at the fine track position of the original recording track according to the detected servo information.

Method of controlling a disk head position by individually timing zones

An information recording and reproducing apparatus of the hard disk type comprises a motor for rotatably driving hard disks secured to a driving hub attached to the driving shaft thereof, a pivot assembly having a pivot shaft supporting a swing arm for swing motion thereon, magnetic heads attached to the free end of the swing arm so as to be located opposite to the surfaces of the hard disks, respectively. The lower bearing among the bearings rotatably supporting the driving shaft of the motor and the lower bearing among the bearings rotatably supporting the pivot shaft of the pivot assembly are always urged in the same direction by bearing biasing means, respectively. When gaps are formed between the lower bearing of the motor and the inner wall of the bearing housing and between the lower bearing of the pivot assembly and the inner surface of a hole receiving the pivot assembly due to the difference between the lower bearings and the surrounding parts, the driving shaft of the motor and the pivot shaft are tilted in the same direction practically by the same angle, so that the off-track of the magnetic heads is limited to the lease extent, and hence the deterioration of the recording and reproducing performance of the apparatus due to thermal expansion of the components is prevented.

Growing community of inventors

Fukushima-ken, Japan

Isao Asano