Write laser power normalization method for magneto-optical disk drives

Under the ISO/IEC 10090 specification for magneto-optical disks, write conditions including write laser power should be appropriately written on control tracks. However, the definition and measurement method of the write power are not necessarily clear. Satisfactory normalization schemes for the write power should be developed. In this paper we describe the possibility of normalizing the write power of optical disk drives using a typical laser power. The main findings obtained were as follows. (1) Saturation curves normalized by a typical laser power were correlated well in shape in the laser power range in which jitter and error rate are minimum. (2) Our results show the possibility of normalizing the write power of drives using a typical laser power of a calibration disk and the feasibility of a relative value method for facilitating optical disk interchangeability.