| 摘要 |
A rewritable disc that is adaptive for indicating whether a single-sided recording layer or a double-sided recording layer exists. The disc has an identification information for indicating whether any one of the single-sided recording layer and the double-sided recording layer exists. The identification information is preformatted on a specified region, such as a control data area, a lead-in area and a lead-out area, etc., of the disc.
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