必须是可安装的文件系统。
软件包只包含可安装的映像；所有文档在文档包中。
The package contains only the installable image; all documentation is in the documentation package.
接下来，将显示一个可安装的产品的列表(图12)。
Next, you are presented with a list of products that are available for installation (Figure 12).
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