如果服务器中安装了多个操作系统，您需要从引导加载程序菜单中选择需要引导的操作系统。

If you have multiple operating systems installed on your server, you need to select which one you want from the boot loader menu.

youdao

在讨论引导新的驱动器之前，需要了解一些引导加载程序理论。

Before I discuss booting up your new drive, a little boot loader theory is required.

youdao

我也可以在内置驱动器的MBR中安装引导加载程序，并使用它引导US b驱动器(这时它在GRUB中显示为hd 1 in GRUB)。

I was also able to install a boot loader in the MBR of the internal drive and use that to boot the USB drive (where it appeared as hd1 in GRUB).

youdao