BIOS会从第一个启动设备开始，这个启动过程，如果BOIS没有找到第一个启动设备，则会使用列表中的下一个设备尝试启动。
The BIOSwilltry to initiate the boot sequence from thw first device.If the BIOS does not find a device,it will try the next device in the list.
你可能对两种类型的软件很熟悉，操作系统和应用软件。
You are probably very familiar with two different types of software: the operating system and the applications.
BIOS软件要之前许多不同的任务，但最重要的任务是载入操作系统。
The BIOS software has a number of different roles, but its most important role is to load the operating system.