Abstract:
A disk drive (10) having dimensions of 5.15 inches long, 4.00 inches wide, and 0.805 inch high is provided. The disk drive (10) includes a cover (14) engaging a base (12) to form therebetween a controlled environment isolated from ambient atmosphere conditions. A storage medium, comprising a single magnetic plated disk (22) having a central point (21) to a plurality of concentric tracks, is rotatably mounted on said base (12) within the controlled environment. A means (20) for rotating the storage means about an axis passing through its center point, preferably comprising a spindle motor (20), is also mounted on said base (12). Transducers (60), one per disk surface, for reading and writing information to the disk (22), are mounted on an actuator (50) which positions the transducers (60) over selected, individual, concentric tracks on the disk (22). A printed circuit board (PCB) (15) provides control signals to the spindle motor (20), transducers (60), and the actuator (50) to selectively access the stored data.
Abstract:
A method of centering a disk (14) on a disk drive motor (10) with respect to the rotational axis (11) of the motor (10) and/or for balancing the disk (14) to reduce operating vibration of the disk (14) and motor assembly. The centering/balancing method is performed by placing a contact element (30) in contact with the outer diameter (20) of the disk (14) and moving the contact element (30) towards the rotational axis (11) of the motor (10) until the inner diameter (22) of the disk (14) contacts a portion of the hub (12) of the motor (10) which protrudes into the center hole of the disk (14). Then, the disk (14) is rotated while the contact element (30) is simultaneously moved away from the rotational axis (11) of the motor (10) at a rate related to the rotational speed of the disk (14).
Abstract:
An under-the-hub spin motor (8) for a disk drive includes a shaft (12) having a first portion (12a) mounted to a support member (10) and a second portion (12b) having first and second bearings (26) provided at the first and second ends thereof. A hub (34) is supported by the first and second bearings (26) and a disk (40) having an inner diameter (D2) is mounted on the hub (34). A stator (16) is provided on the support member (10) so that the stator is outside of the Z-axis region between the bearings (26) and a rotor (46) is provided on the hub (34) so that the rotor (46) is concentric with the stator (16) and so that a gap (48) is defined between the stator (16) and the rotor (46). The gap (48) has a radius larger than the inner diameter (D2) of the disk (40).
Abstract:
A method for controlling assertion of a write inhibit signal in a disk drive (20) is described. The disk drive comprises at least one rotating disk (22) having data recording surfaces, and a head (24) for each recording surface. Each head is mounted by an actuator (28) for selective positioning of the head over the respective disk surface. Each disk surface includes data tracks. The method comprises the steps of calculating and storing a write inhibit threshold value (42a) for each head in the disk drive, performing a track following operation to determine position of a preselected head relative to a preselected data track, retrieving the write inhibit threshold value for the preselected head, comparing the determined head position to the retrieved write inhibit threshold value and asserting a write inhibit signal upon a certain relationship between the determined head position and the retrieved write inhibit threshold value.
Abstract:
For use in a disk drive, a head comprising a slider (26) having a bottom air bearing surface, a leading edge and a trailing edge; a magnetic transducer mounted by the slider at the trailing edge of the slider; and a protective overcoat (40) adhered to the air bearing surface of the slider and having a leading edge and a trailing edge. The trailing edge of the protective overcoat being spaced from the trailing edge of the slider such that the minimum distance from the slider to the surface of a disk in the disk drive is between the magnetic transducer (25) and the disk surface (22).
Abstract:
A digital phase detector that stores four sequential digital samples in a shift register (15). The contents of the shift register (15) is evaluated at one half the clock frequency which generate the digital samples. The digital phase detector predicts what the value should be for each of the two middle samples in the shift register. The predicted value and the actual value of each middle sample are used to generate a correction signal (20, 21). The correction signals for the two middle samples are then added (22) to produce a total correction signal which is to be used in controlling the phase and frequency of the voltage controlled oscillator in the phase locked loop generating the clock that controls the generation of the digital samples.
Abstract:
A system and method is disclosed wherein the position of a recording head is kept in proper alignment with the centerline of the track of a recording medium despite any tape wander. Further, the speed in which the tape propagates during both read and write modes is maintained. These functions are performed using the servo information written into the tracks of the recording medium. Tape propagation speed is controlled by adding the servo signal together. Head positioning is controlled by taking the difference between the servo signals. A method using Walsh Transforms is disclosed for normalizing the amplitude of the servo information used to accurately control head positioning and tape propagation speed.
Abstract:
A dynamic buffer chamber in an in-line sputtering apparatus for fabricating magnet recording disks for Winchester-type hard disk drives, the dynamic buffer chamber being positioned between first and second processes of the sputtering apparatus to isolate the respective processes from each other with respect to pressure, temperature and gaseous composition.
Abstract:
A low profile mechanism for biased driving of driven roller in tape cartridge includes a rotor-on-the-outside motor placed on a reciprocating base plate and moved by the base plate to engage a drive roller with a predefined control force. The drive roller is translatable such that it conveys all or part of the control force to the driven roller or a supplied tape cartridge.
Abstract:
A disk drive for flying at extremely low flying heights. The drive includes a disk clamp for clamping one or more disks within the disk drive, with the clamp exerting a substantially uniform pressure at the circular line of contact between the clamp and the disk. The disk clamp includes a raised circular wall around an outer radius of the clamp, which wall is formed as part of and integrally with the rest of the clamp. The wall serves to increase the structural rigidity of the clamp in a single axial section of the clamp, thereby providing a "stress barrier" to the transmission of localized stresses from the screw points. Thus, the pressure exerted by the clamp on the disk is evenly distributed around the entire clamp, and the distortion normally occurring at the inner diameter of the disk with conventional disk clamps is greatly reduced.