| http://www.w3.org/ns/prov#value | - As the non-magnetic substrate on which such a magnetic layer is formed, plastic films having appropriate flexibility and stretch resistance and heat resistance upon vapor deposition may be used, for example, films made of polyester, acetate, polycarbonate and polyimide with a thickness of 5-25 ??m, as well as a glass substrate and a metal substrate such as of Al as a disc-like substrate.
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