A STUDY OF CHARACTERISTICS OF DISK VIBRATION AND ROTATING AIR-FLOW INMAGNETO-OPTICAL DISK-DRIVES

A study on dynamic characteristics of rotating disks in magneto optica l disk drives is presented. Natural frequencies of the rotating disks are investigated experimentally and numerically. The frequency respons e and critical speeds of the ASMO disk are discussed. The characterist ics of airflow around the disk and their effects on disk vibrations ar e also investigated. If is found that the numerical calculation of the natural frequencies of rotating dish agrees well with the experimenta l results. The airflow around the disk in the cartridge affects the ch aracteristics of the disk vibrations to reduce the modal frequencies o f the disk. The experiment shows that negative vertical offsets of the disk in the cartridge possibly increase the vibration amplitudes. Bei ng influenced by the geometry of the cartridge, the rotation of the di sk causes an asymmetric airflow in the presence of window.