From Working EDRM
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A disk storage technology which competes with traditional magnetic hard disks. Form factors are 3.5", 5.25" and 12". Advantages are that one 5.25" magneto-optical drive can store about 1.3GB (3 1/2" hold up to 230MB); media is removable and portable; and, can last for 20 years – ideal for archival storage. The disadvantages are cost, traditionally slower disk access and longer disk write times. The information is written on the disk by changing the polarity with strong magnets and read by a laser by sensing the magnetic flux changes (1's or 0's). This technology is re-usable.