在概要根目录外的文件将被忽略，因为在概要操作更改中包括安装卷快照时，这些文件将变得不相关。
The files that sit outside of the profile root are ignored because they become irrelevant when you include a snapshot of the installation volume with profile action changes.
指向包含要描述的卷的根目录的字符串的指针。
A pointer to a string that contains the root directory of the volume to be described.
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