If a record start position of the user data is learned beforehand in the next recording layer, the guard block is formed on the next recording layer prior to the recording of the user data.
如果下一个记录层的用户数据的记录开始位置预先知道，在用户数据记录之前，在下一个记录层上形成保护块。
If a record start position of the user data is learned beforehand in the next recording layer, the guard block is formed on the next recording layer prior to the recording of the user data.
如果下一个记录层的用户数据的记录开始位置预先知道，在用户数据记录之前，在下一个记录层上形成保护块。
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