A study of characteristics of disk vibration and rotating airflow in magneto optical disk drives

A study on the dynamic characteristics of rotating disks in magneto optical disk drives is presented. The natural frequencies of the rotating disks are investigated experimentally and numerically. The frequency response and critical speeds of the advanced storage magneto optical (ASMO) disk are discussed. The characteristics of airflow around the disk and their effects on the disk vibrations are also investigated. It is found that the numerical calculation of the natural frequencies of the rotating disks agrees well with the experimental results. The airflow around the disk in the cartridge affects the characteristics of the disk vibrations to reduce the modal frequencies of the disk. The experiment shows that negative vertical offsets of the disk in the cartridge possibly increase the vibration amplitudes. Being influenced by the geometry of the cartridge, the rotation of the disk causes an asymmetric airflow in the presence of a window.