default device and file name [计] 缺省设备和文件名
(changing the partition device file name as necessary).
根据需要改变分区设备文件名。
You point it toward a destination, which is a file or a device, and then name the files that you want to package.
只需将它指向一个目的（可以是文件或设备），然后指定您想要打包的文件。
Because label, UUID, and friendly name will bond with a dedicated device forever, no matter what device ID it has or what device name it gets, your system will always find your root file system disk.
由于标签、UUID和友好的名称将永远与专用设备绑定在一起，因此不管拥有什么设备ID或者使用什么设备名称，系统总是能够找到根文件系统磁盘。
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