Mechanical Performance Characteristics of 15000 rpm Ultra-high-speed Rotation of an Ultra-thin Disk with a Magneto-optical Recording Film

Abstract

We developed a stacked volumetric optical disks (SVOD) system to realize a data capacity of over 1 TB in a cartridge. To increase the read and write speed of the SVOD system, the mechanical performance characteristics of the 92-μm-thick thin optical disk stored in the SVOD cartridge were investigated by combining the magnetic amplifying magneto-optical system (MAMMOS) structure and 15000 rpm ultra-high-speed rotation. The minimum 40 nm mark length has already been reached with MAMMOS recording. This corresponds to 100 GB per disk of CD size. The thin optical disk can be rotated at over 10000 rpm because thin optical disks are flexible, and shatter rarely in comparison with conventional 1.2-mm-thick optical disks. As a result of the study, the mechanical performance characteristics were found to be acceptable for practical use. Therefore, the maximum data transfer rate can be upgraded to more than 2 Gbps by using a combination of thin optical disks, magneto-optical (MO) recording, and 15000 rpm ultrahigh-speed rotation.