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Front illumination is the fastest type of optical disk. Front illumination also allowed us to design a
very small and light head with a beam size of 1 mm. It also allowed us to use an opaque aluminum
substrate, which can rotate at high speeds. If optical disks are mounted in an enclosure like those for hard
disks, they are protected from contamination and front illumination would be practical.
Seiya Ogawa andMiyozo Maeda
"Magneto-optical recording enhanced by magnetic recording techniques", Proc. SPIE 1248, Storage and Retrieval Systems and Applications, (1 August 1990); https://doi.org/10.1117/12.19622
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Seiya Ogawa, Miyozo Maeda, "Magneto-optical recording enhanced by magnetic recording techniques," Proc. SPIE 1248, Storage and Retrieval Systems and Applications, (1 August 1990); https://doi.org/10.1117/12.19622