Nec Corporation

Hoya Corporation

Takanori Mizuno

Yosuke Suzuki

Yoshiteru Imaeda

A method for manufacturing a glass substrate for a magnetic disk comprises a surface grinding step of processing a mirror-surface plate glass, having a main surface in the form of a mirror surface, to a required flatness and surface roughness using fixed abrasive particles. The method comprises, before the surface grinding step using the fixed abrasive particles, a surface roughening step of roughening the surface of the mirror-surface plate glass by frosting.

Method of manufacturing a glass substrate for a magnetic disk

A circuit for executing range shift-up/-down of pass metric values is provided as an additional circuit preceding to an ACS circuit for adding and comparing branch metric computation values and preceding pass metric values and selecting the highest likelihood pass. It is thus possible to permit effective use of RAM bits by executing range shift-up and the accuracy of the effective bits of input data when it is necessary to expand the effective bits of the pass metric values, while executing range shift-down and increasing the accuracy of the input data when the effective bits of the pass metric values are not fully used.

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Tokyo, Japan

Takanori Mizuno