3.5_Magnetic
Sony introduced the first 128 MB 3.5" MO disk in 1991 and subsequently launched 230MB, 540/640MB, and LIMDOW versions as well to accommodate a wide range of applications. In order to maintain the broadest application spectrum possible and ensure that older data stored on previous generations of MO are easily accessible, the GIGAMO drive is designed to be able to read and write MO disks of all capacities, thereby providing a secure migration path to the future. Sony's original anti static hard coat protects the disk against scratches and dust, and the shutter is made of a strong, lightweight and wear-resistant aluminum alloy which contains a high magnesium content to maximize smooth disk operation.

2.3 GB capacity on one pocket-sized 3.5" MO disk.
Backward drive compatibility with all 3.5" MO media.
5.92 MB/s data transfer rate.

5.25" Magneto Optical Disks
Sony MO disks offer consistently stable performance, thanks to the adoption of Sony's own Wide Margin Recording Film, which can accommodate fluctuations in the laser power of a variety of user environments, as well as a high-precision stamper and molding technology. The use of Sony's own cartridge design and parts gives Sony MO disks as many as 100,000 load/unload cycles per side for superior durability in auto-changers.

Maximum data transmission of 6MB/s and average seek time of 25 milliseconds.
High-speed Sony MO disks spin at hard-disk speeds, so files can be accessed in milliseconds.
Non-contact read/write and Sony materials science gives a 50-year archival life with over 10 million read/write cycles and 1 billion reads.