Servo pattern writing method and apparatus thereof

A servo pattern writing method, comprising the steps of:

• fixing plural recording media around a spindle hub;
• applying a load to a push-aside mechanism to push aside the plural recording media with respect to the center of the spindle hub in one direction;
• in a direction opposite to said direction, moving a come-back mechanism until the come-back mechanism reaches each of the plural recording media;
• applying a load, larger than the load applied from the push-aside mechanism, to the come-back mechanism, moving the plural media by a half of the outside diameter of the spindle hub minus the average inner diameter of the plural recording media;
• and
• writing a servo pattern onto the plural recording media.

A servo pattern writing method, comprising the steps of:

• fixing plural recording media around a spindle hub by means of a clamp;
• applying a load to a push-aside mechanism to push aside the plural recording media with respect to the center of the spindle hub in one direction;
• in a direction opposite to said direction, moving a come-back mechanism until the come-back mechanism reaches each of the plural recording media;
• releasing the clamp;
• applying a load to the come-back mechanism to move the plural recording media by a half of the outside diameter of the spindle hub minus the average inner diameter of the plural recording media;
• fixing the plural recording media again around the spindle hub by means of the clamp;
• and
• writing a servo pattern onto the plural recording media.

A servo pattern writing apparatus comprising:

• a spindle hub around which a recording medium is fixed;
• a spindle motor having the spindle hub fixed thereto and rotating the spindle hub;
• a head for reading and writing a servo pattern from and to the recording medium;
• a head actuator mechanism for driving the head;
• a first mechanism which moves the recording medium fixed around the spindle hub;
• a second mechanism which is placed opposite to the first mechanism around the spindle hub and moves the recording medium in a direction opposite to the moving direction of the first mechanism;
• and
• a controller which drives the first mechanism to push aside the recording medium with respect to the center of the spindle hub in one direction;
• drives the second mechanism to move the recording medium by a half of the outside diameter of the spindle hub minus the average inner diameter of the recording medium in a direction opposite to the moving direction of the first mechanism;
• generates the servo pattern;
• and drives the head actuator.