Abstract: There is provided a sterilization apparatus capable of delaying degradation of sterilant in a cartridge or a tank in which an extraction tube is inserted. A sterilization apparatus extracting sterilant from a cartridge containing the sterilant and sterilizing a sterilization target includes an extraction tube configured to extract the sterilant from the cartridge, and a movement unit configured to move the extraction tube so that a position of the extraction tube with respect to the cartridge in a case of extracting the sterilant in the cartridge by the extraction tube and a position of the extraction tube with respect to the cartridge in a case of waiting for extraction of the sterilant from the cartridge by the extraction tube to perform following sterilization processing with the same cartridge may differ from each other.

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.