Abstract: An acceleration detecting apparatus for a magnetic disk apparatus capable of detecting with high reliability the disturbances such as rotational and translational shocks and vibrations applied externally to the magnetic disk apparatus to thereby prevent destruction or the like damages of data recorded on a disk of the magnetic disk apparatus upon occurrence of off-track event under the influence of the disturbance. The apparatus includes a pair of acceleration detectors for detecting acceleration in two directions extending discretely in parallel to each other. The acceleration detectors are disposed at positions closer to the magnetic disk relative to a pivot shaft for a head supporting arm as viewed in a longitudinal direction of an oblong box-like casing of the magnetic disk apparatus in a plane which forms an angle not greater than 10 degrees relative to the plane of the magnetic disk.

Abstract: It is an object of the present invention to provide a magnetic disk apparatus capable of recording a servo signal onto the surface of a magnetic disk with a high degree of reliability and a high degree of efficiency without using an external write apparatus and capable of recording a predetermined servo signal onto the surface of a magnetic disk even if dimensional variations of a recording/reproducing device of a head exist.

Abstract: In a magnetic disk device after being sealed, just when a magnetic head is loaded onto a disk on which any signal is not recorded yet, a write current to the head that the magnetic disk device itself has is turned on and off to thereby write a recording region detecting signal at the loading point on the disk. In addition, a product-purpose recording region is provided between this signal-recorded position and the inner periphery (or outermost periphery) to which the head is regulated by a stopper. According to the present invention, the recording region can be specified by the disk device itself, and self servo-write can be performed to write a designed number of tracks at a precise pitch without using any external writing device.

Abstract: The magnetic disk apparatus includes a magnetic disk for storing thereinto information; a head equipped with a recording conversion element for writing information into the magnetic disk and a reproducing conversion element for reading information from the magnetic head; an actuator arranged by a suspension for supporting the head so as to move the head on the magnetic disk, and also a drive apparatus for driving the suspension; and a stopper for limiting a movable range of the actuator, whereby a distance between a reproduction element and a recording element is measured and also a track width of the magnetic disk is measured in order to execute a self-servo write operation.

Abstract: Under existence of an impact and a vibration, a throughput and a reliability of a recording and reproducing operation in a magnetic disc apparatus are reduced. Accordingly, a mechanism for fixing a coarse moving actuator at an optional position is provided, at a time of following to a track, a motion of the coarse moving actuator is restricted and a positioning is performed by a fine moving actuator. Even when a vibration and an impact is applied from an external portion during the track following operation, it is possible to prevent the head position from being shifted and it is possible to perform a recording and reproducing operation. Further, it is possible to prevent adjacent data from being erroneously broken.