Abstract: A servo pattern writing method of writing a servo pattern for the positioning control of a magnetic head on a magnetic disk comprises changing the rotating speed of the magnetic disk with the magnetic head positioned at one or more proper radial positions with respect to the magnetic disk. The rotating speed of the magnetic disk is changed on the basis of the magnitude of a synchronous vibration synchronous with the rotation of the magnetic disk. Writing current for writing a servo pattern is set according to the change of the rotating speed of the magnetic disk. The STW rotating speed is changed according to the change of the radial position of the magnetic head to reduce the intensity of the vibration that is generated during a servo pattern writing operation to a value meeting a positioning level. The servo track writing operation can be achieved at a low cost.

Abstract: A servo pattern writing method of writing a servo pattern for the positioning control of a magnetic head on a magnetic disk comprises changing the rotating speed of the magnetic disk with the magnetic head positioned at one or more proper radial positions with respect to the magnetic disk. The rotating speed of the magnetic disk is changed on the basis of the magnitude of a synchronous vibration synchronous with the rotation of the magnetic disk. Writing current for writing a servo pattern is set according to the change of the rotating speed of the magnetic disk. The STW rotating speed is changed according to the change of the radial position of the magnetic head to reduce the intensity of the vibration that is generated during a servo pattern writing operation to a value meeting a positioning level. The servo track writing operation can be achieved at a low cost.

Abstract: When supporting an HDA including an H/DA and an electronic control circuit board for controlling the same in a fixed frame (drive bay) of upper level apparatus by means of elastic or “soft” fixation, counterforce of an FPC cable gives it bad influence. When rigidly securing the HDA in a translational motion direction while attaining soft fixation in a direction of rotation, the HDA is rotatably supported with its center of gravity being as the center of rotation in a soft secure/support mechanism as taught from Published Japanese Patent Application No. 8-161880 (JP-A-8161880) for example; however, in the case of employing one of commercially available general purpose HDAs, this is disposed so that a bent or curved portion of its cable is identical in position to the rotation center or placed at a nearby location of the gravity center to thereby preclude the stiffness of an FPC cable hardly affects such rotatable support mechanism.