Magneto Optical (MO)
Magneto-optical discs were introduced in 1985 and used a combination of magnetic and optical technologies to record large quantities of data on a disc that looked like a CD in a permanent case. The first versions were WORM drives (write on, read many), but later systems introduced full rewrite capabilities. Magneto-optical drives are generally backward compatible, meaning a 640 MB drive should be able to read and write discs with 230 MB and 128 MB capacity.
- Year: 1985
- Dimensions: 5.25″ or 3.5″
- Capacity: 650 MB to 9.2 GB for 5.25″ discs, and 128 MB to 2.3 GB for 3.5 discs
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