A removable disk clamp assembly for mounting disk media on a motor-driven spindle of a magnetic read-write device includes a disk clamp and a mechanism for generating a predetermined force to press the disk media to a flange of the spindle such that the predetermined force can be repeatedly overcome by an applied counterforce to remove the disk clamp from engagement with a hub of the spindle. Such a mechanism may include a spring-loaded removable disk clamp assembly or a magnetic removable disk clamp assembly, and whereby a vacuum-driven chuck may be employed for disk and clamp handling purposes, all of which are suitable for implementation and use in a read-write device configured for use in an archival data storage system library such as in a cleanroom storage system.

There is provided an optical disc drive that can guide the center of an optical disc to the position of a spindle motor, while allowing the number of components to be reduced. A base frame includes a stopper portion that comes into contact with an outer edge of the optical disc having reached the position of a spindle motor and that restricts backward movement of the optical disc. A switch arm includes a contact portion located on a side opposite to the stopper portion across the optical disc having reached the position of the spindle motor, and the switch arm uses the contact portion to push the optical disc toward the stopper portion.

There is provided an optical disc drive that can maintain contact between an optical disc and a conveying roller, while allowing the number of components to be reduced. A conveying roller includes a right roller that is rotatable around an axis and a left roller that is rotatable around an axis. The right roller portion and the left roller portion are arranged in a lateral direction. One of a right end portion of the right roller portion and a left end portion of the left roller portion is movable in an up-down direction relative to the other of the right end portion of the right roller portion and the left end portion of the left roller portion, with a relative position between the axis and the axis unchanged.

A conveying roller position manipulation mechanism moves the position of a conveying roller between a first roller position where the conveying roller contacts an optical disc and a second roller position where the conveying roller is separated from the optical disc. A centering mechanism aligns the center of the optical disc with the position of a spindle motor. A chucking pulley operation mechanism manipulates the position of a chucking pulley configured to fix the optical disc to the spindle motor. The conveying roller position manipulation mechanism includes a rotary arm configured to move in response to a collision with the optical disc that approaches the position of the spindle motor, and at least one of the centering mechanism and the chucking pulley operation mechanism includes a member coupled to the rotary arm.

A conveying roller position manipulation mechanism moves the position of a conveying roller between a first roller position where the conveying roller contacts an optical disc and a second roller position where the conveying roller is separated from the optical disc. A centering mechanism aligns the center of the optical disc with the position of a spindle motor. A chucking pulley operation mechanism manipulates the position of a chucking pulley configured to fix the optical disc to the spindle motor. The conveying roller position manipulation mechanism includes a rotary arm configured to move in response to a collision with the optical disc that approaches the position of the spindle motor, and at least one of the centering mechanism and the chucking pulley operation mechanism includes a member coupled to the rotary arm.

A conveying roller contacts and conveys an optical disc toward a position of a spindle motor when the conveying roller is in a first roller position, and does not contact the optical disc when the conveying roller is in a second roller position. A slider places the conveying roller in the first roller position when the slider is in a first operation member position, and places the conveying roller in the second roller position when the slider is in a second operation member position. A first transmission mechanism transmits rotation of a loading motor to the conveying roller. A second transmission mechanism transmits the rotation of the loading motor to the slider. A distribution mechanism engages with each of the first transmission mechanism and the second transmission mechanism to distribute the rotation of the loading motor to the first transmission mechanism and the second transmission mechanism.

A ring-shaped spacer is to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A maximum height surface roughness Rz of an outer circumferential edge surface of the spacer is at least 1.5 μm, and the spacer is made of amorphous glass.

A ring-shaped spacer is to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A maximum height surface roughness Rz of an outer circumferential edge surface of the spacer is at least 1.5 μm, and the spacer is made of amorphous glass.

A disc device includes a first traverse chassis holding a first optical pickup unit which performs recording/reproduction of information on a first surface of a disc, a second traverse chassis holding a second optical pickup unit which performs recording/reproduction of information on a second surface of the disc, and first and second biasing members which bias the first and second traverse chassis, respectively, in directions of coming closer to each other. The first and second traverse chassis are coupled to each other so as to turn around a turning axis at a rear side of a housing and extending in a width direction of the housing. At least one of the first and the second biasing members is attached while being inclined with respect to each of a conveying direction of the disc, and a thickness and the width directions of the housing.

Aspects of the disclosure provide for mitigating a coefficient of thermal expansion (CTE) mismatch between glass components and adjacent metal components in a disk storage device to improve thermal and shock performance. The methods and apparatus provide a hub, provide a first recording disk comprising a glass material and a center hole on the hub such that the hub extends through the center hole of the first recording disk, provide a first spacer on the first recording disk, the first spacer comprising a nickel-iron alloy, and provide a second recording disk comprising a glass material and a center hole on the first spacer such that the hub extends through the center hole of the second recording disk, wherein the first recording disk and the second recording disk each comprise a magnetic recording layer configured to store information.