| 摘要 |
PROBLEM TO BE SOLVED: To easily measure the available capacity and/or empty capacity of an optical disc. SOLUTION: The gage comprises an engaging part 82 engaged with a center hole of an optical disc and a capacity indicator for measuring the available capacity and/or the empty capacity of the optical disc, based on the position of a boundary between a recorded region and an unrecorded region of the optical disc, identified from the tone difference between them; the indicator has scale divisions 87 corresponding to the format of the optical disc in the radial direction of the optical disc.
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