The ink jet ink includes pigment, first resin which has a glass-transition temperature of less than 20\xb0 C. The tissue penetration device may optionally include sampling and analyzing functions, which may be integrated. The rail position control system further includes a computer system that is operatively coupled to the camera and to a motor. The feedback circuit is coupled to the output terminal and is configured to generate a feedback signal based on an actual voltage level at the output terminal. A second axis, about which the gripper moves in the peripheral direction of the cylinder, is also provided. Therefore, even if the sector detection window is remained to be in an opened state, bit strings of data sector, address information in a servo sector or the like is not falsely recognized.