A method or apparatus for changing a performance level of a disk drive from an initial performance level to a target performance level, wherein the disk drive includes a profile table. A transparent window is disposed in alignment with the infrared light source and between the upper and lower transparent substrates. The practice of the method of the invention using the cytokine IL-10 is specifically described. Thus, the YUV data is formed in units of five lines. For this, the temperature of the sinter powder is detected in the sinter point and the power of the laser is controlled depending upon the detected temperature. The circular profile thins along the race toward an hourglass profile, and has, at a second end, an elongated shape.