Abstract:
The system invokes a learning subroutine (600) under which a set of error location vectors are established, one for each possible location of the defective servo sample. With each error location vector, if the performance improves when it is applied then the estimation is taken to be correct, and the location of the defective sample is saved. If the performance is worse upon application of the error location vector, then the estimation is taken to be incorrect, and a different error location vector is used. During further read and write operations with the disk, the system may ignore the position error signal at the bad servo sample locations, or may adjust for bad servo samples by using a compensating position error signal vector.
Abstract:
A spindle motor control circuit (20) for controlling the acceleration and position locking of a spindle motor (22) includes a first mode of operation whereby the spindle motor (22) is commutated through use of an external clock (32, 34). The control circuit (20) then causes the spindle motor (22) to be self-commutation based on the clock developed from transitions detected by a transition detector (71), which transitions are signals provided from the phase windings of the spindle motor (22). A final mode includes the reading of servo information from the servo sectors on the disc (24) in order to control the final acceleration and position of the spindle motor (22).
Abstract:
A disk drive (30) for receiving a removable cartridge (200) having a recess (266, 270) formed in an exterior surface thereof, and an engaging surface of the disk assembly mounting mechanism (56) is located in that recession. The drive possesses a handle (58) having a lever (70) which extends into the recess to contact the engaging surface of the disk assembly mounting mechanism, whereby further movement of the handle causes the mounting mechanism to move in such a manner that a disk assembly within the removable cartridge is positioned over a spindle motor (54) of the drive for mounting thereto. Other features such as position sensors and enhanced cartridge positioning mechanisms are also provided.
Abstract:
A removable cartridge (200) having a housing (202, 204) and a recess formed therein in which is located a tang (208) of a cartridge mounting mechanism. The cartridge mounting mechanism provides for positioning of a disk assembly (220, 226) located within the removable cartridge (200) over a spindle motor (54) for mounting thereto. By recessing the tang (208) of the mounting mechanism, the overall height of the cartridge (200) is reduced. The removable cartridge (200) also includes a specially configured slot (256) for enhanced positioning of the removable cartridge relative to a disk drive.
Abstract:
A disk drive (30) conforms to the 1.8 inch form factor through use of, for example, a removable cartridge (200) which has a disk (220) mounted on the hub (226) which hub (226) is manipulatable by a multifunction handle (58) of the disk drive (30), allowing the hub (226) to be seated on the spindle motor nose (56) of the disk drive (30). The multifunction handle (58) of the drive (30) provides for a compact, high capacity design by performing cartridge hub seating operations, cartridge ejection operations, head arm assembly unlocking operations, and handle locking and unlocking operations to ensure proper operation of the disk drive (30). The disk drive (30) includes an inventive ramp (66) design which allows the head arm assembly (64) to be initially received within the cartridge (200) as the cartridge (200) is inserted into its final registration position in the disk drive receiving mechanism (53) and to be more tangent with respect to the disk (220).
Abstract:
A cartridge (20) for a disk drive (130) includes a door (44) which can be urged from a closed position to an opened position which is substantially within the cartridge (20) and located in a plane substantially parallel to the disk (42) contained in the cartridge (20). The cartridge (20) includes a mounting mechanism (48) for accomplishing the motion of the door (44) from the closed to the opened position and a locking mechanism (50) for locking the door (44) in the closed position. Further, the cartridge (20) includes a groove (52) which extends rearwardly and across the cartridge in order to lockingly engage the cartridge in the drive (130).
Abstract:
A disc drive (420) includes a spindle motor (432) having a stator assembly (436) which is provided in a radial gap configuration. A removable cartridge (422) includes a rotor assembly (472) mounted on a bearing arrangement (468) which additionally mounts the disc (430) contained in the cartridge (422). When the cartridge (422) is placed in the drive (420), the rotor assembly (472) of the cartridge (422) comes into alignment with the stator assembly (436) of the drive (420) so that the spindle motor (432) can cause the disc (430) contained in the cartridge (422) to rotate at the proper speed.
Abstract:
A disc drive (22) having a head (26) actuated by an actuator (32) for seeking out a destination track (30) includes servo velocity control circuitry (31) and servo position control circuitry (41). The servo velocity control circuitry (31) seeks out the destination track and places the head within the boundaries of that track while the servo position control circuitry (41) using servo information places the head on the centerline of the destination track. The fine servo control circuitry (20) is provided for communicating the information generated by the servo position control circuitry (41) to the servo velocity circuitry (31) when the head (26) is several tracks from the destination track in order to allow the actuator (32) to smoothly and quickly cause the head to seek within the boundaries of the destination track without overshooting that track.
Abstract:
A disc drive (20) includes a tray assembly (34) for positively seating and locking a cartridge (21) onto a spindle motor (82). The drive (20) includes heads (108), (110) mounted on a radial arm voice coil actuator assembly (112) and appropriate mechanisms including the arm control asssembly (126) and the ratchet (124) and pawl projection (170) to ensure that the heads (108), (110) are properly loaded onto the disc (90) and that the cartridge (21) insertion and ejection process does not cause damage to the heads (108), (110) or the disc (90) contained in the cartridge (21). Further the drive (20) includes controls such as the cartridge load lever (32) and the release button (30) which are not exposed and cannot be accidentally tripped during data transfer operations.
Abstract:
A disk drive (30) for receiving a removable cartridge (200) having a recess (266, 270) formed in an exterior surface thereof, and an engaging surface of the disk assembly mounting mechanism (56) is located in that recession. The drive possesses a handle (58) having a lever (70) which extends into the recess to contact the engaging surface of the disk assembly mounting mechanism, whereby further movement of the handle causes the mounting mechanism to move in such a manner that a disk assembly within the removable cartridge is positioned over a spindle motor (54) of the drive for mounting thereto. Other features such as position sensors and enhanced cartridge positioning mechanisms are also provided.