Abstract: According to one embodiment, a magnetic disk drive includes a disk, a first microactuator, a second microactuator and a servo controller. The disk comprises a first surface and a second surface. The first and second microactuators allow first and second heads associated with the first and second surfaces to make micromotion based on first and second operation amounts, respectively. The servo controller provides a third operation amount to the first microactuator as the first operation amount and provides an operation amount obtained by inverting a polarity of a frequency component with a particular frequency contained in the third operation amount, to the second microactuator as the second operation amount, if the third operation amount is generated as an operation amount to be provided to the first microactuator in a particular mode in which the first surface is used as a tracking surface.

Abstract: According to one embodiment, a magnetic disk drive includes a disk, a first microactuator, a second microactuator and a servo controller. The disk comprises a first surface and a second surface. The first and second microactuators allow first and second heads associated with the first and second surfaces to make micromotion based on first and second operation amounts, respectively. The servo controller provides a third operation amount to the first microactuator as the first operation amount and provides an operation amount obtained by inverting a polarity of a frequency component with a particular frequency contained in the third operation amount, to the second microactuator as the second operation amount, if the third operation amount is generated as an operation amount to be provided to the first microactuator in a particular mode in which the first surface is used as a tracking surface.

Abstract: According to one embodiment, a magnetic recording medium includes a substrate and a single domain magnetic dot. The single domain magnetic dot is provided on the substrate and is written with a compensation signal for controlling the position of at least one of a recording device and a reproducing device. The single domain magnetic dot has a length in the radial direction of the substrate shorter than a length in the circumferential direction of the substrate.

Abstract: A disk device comprises a disk having predetermined information sectors recorded at a constant interval; a head scanning the disk; and a disturbance-compensation unit obtaining an amount of a disturbance based on a time-interval measurement in reading the predetermined information sectors so as to compensate a position of the head according to the amount of the disturbance.

Abstract: A disk drive unit includes acceleration sensors mounted thereon. A sequence for calculating an amount by which a head actuator is adjusted during recording and readout operations is changed based on an output from the acceleration sensors.

Abstract: A magnetic disk unit has two actuators each rotating on a common rotary shaft. The two actuators are driven by a voice coil motor. The voice coil motor comprises: a magnetic circuit comprising a magnet provided for the two actuators on a common basis and two yokes, which are associated with the two actuators, respectively, said two yokes being disposed at both sides between which the magnet intervenes; and two coils provided for the two actuators, respectively.

Abstract: A cassette auto changer system including a member for selectably providing a plurality of cassettes to be loaded into one or more tape signal readers. A cassette rack is provided including a plurality of cassette receiving compartments, a cassette port accessible from an outer side of the auto changer apparatus whereby cassettes may be inserted or removed from the auto changer apparatus, a tape transfer mechanism operable to selectably transport cassettes between the cassette rack and the tape signal reader, and the cassette port. A YES/NO sensor at the cassette port determines whether a cassette is present in the cassette port. In applicants' cassette auto changer system, when a YES indicator determined by the YES/NO sensor changes to a NO determination, a controller sets the cassette port an IN port empty condition.

Abstract: A cassette auto changer system includes a cassette console mounting a rack for holding a plurality of tape cassettes, a drive console for mounting a tape playing or playing and recording device or a plurality of such devices. A base console mounts the cassette and drive consoles and the entire cassette auto changer system is housed in a housing console. According to a compact design a cassette shuttle portion of the transport mechanism is rotatable both vertically and horizontally and includes means, such as a cassette hand portion, for effecting insertion and extraction of a cassette from one of a plurality of cassette compartments provided in the cassette rack. The cassette hand may also include a release lever engaging a lock lever at each cassette compartment. Further, grasping members include a centering device for achieving a predetermined support position for a cassette. In addition, paired positional detection portions and a corresponding sensors are provided.

Abstract: A disk drive unit mounts an acceleration sensor. A sequence for calculating an amount by which a head actuator is adjusted during recording and readout operations is changed based on an output from the acceleration sensor.

Abstract: A disk device comprises a disk having predetermined information sectors recorded at a constant interval; a head scanning the disk; and a disturbance-compensation unit obtaining an amount of a disturbance based on a time-interval measurement in reading the predetermined information sectors so as to compensate a position of the head according to the amount of the disturbance.

Abstract: A cassette auto changer system includes a cassette console mounting a rack for holding a plurality of tape cassettes, a drive console for mounting a tape playing or playing and recording device or a plurality of such devices. A base console mounts the cassette and drive consoles and the entire cassette auto changer system is housed in a housing console. According to a compact design a cassette shuttle portion of the transport mechanism is rotatable both vertically and horizontally and includes structure, such as a cassette hand portion, for effecting insertion and extraction of a cassette from one of a plurality of cassette compartments provided in the cassette rack. The cassette hand may also include a release lever engaging a lock lever at each cassette compartment. Further, grasping members include a centering device for achieving a predetermined support position for a cassette. In addition, paired position detection portions and corresponding sensors are provided.

Abstract: Disclosed is a calibration method for an acceleration sensor in a storage device for calibrating and a storage device, an enclosure for calibrating the acceleration sensor for compensating a vibration of an enclosure in a state of its being mounted in a storage drive. The calibration method and mode comprises a step of exciting a actuator of the drive by flowing a drive current having a predetermined current value, a step of calculating the acceleration of the enclosure of the drive from the predetermined current value and a mechanical transfer function of the storage device, a step of detecting a measured value of the acceleration sensor, and a step of calculating a sensitivity of the acceleration sensor from the calculated acceleration and from the detected measured value. The acceleration sensor is calibrated in the state of its being mounted in the disk drive, and hence the sensitivity can be precisely calibrated.

Abstract: A cassette auto changer system including a tape signal reading member and a selection member for selecting between a plurality of cassettes. The cassette auto changer includes a base console including a port for tape insertion or extraction operations and having a tape insert compartment. The base console has upper and lower guide rails. A drive console mounts the tape signal reading member and a cassette console mounts a plurality of compartments for storing the tape cassettes. A tape transfer member transports the tape cassettes selectively between the base console, the drive console and the cassette console. An electrically conductive rail is disposed proximate to the guide rails which is powered by enclosed electrical wiring circuitry. In addition, an unmagnetized cassette shuttle body of the tape transfer member is driven along the electrically conductive rail and is guided along the guide rails.

Abstract: Disclosed is a method of demodulating a position signal in a magnetic disk device for reading servo burst signals, which have been recorded in a servo area of a magnetic disk, by a head, and outputting a position signal, which indicates a deviation from a reference position on a track, using the servo burst signals that have been read.