Fix HDD device Boot priority will reset after changing HDD device.

修正在改变硬盘设备后， 硬盘设备的启动优先级会重置的问题。

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The problem is that your hard drive has a higher boot priority than your optical drive.

问题在于你硬盘的启动优先级高于光驱。

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Occasionally you will need to change the device boot priority to be able to boot a live Linux distro from your optical drive.

有时你可能需要更改设备的启动优先级以便能够从光驱启动一个live版的Linxu发行版。

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