所有的PC系统都是通过执行rom(明确地说，BIOS)中的代码从引导磁盘的0柱面0扇区加载扇区，从而开始引导过程。

All PC systems start the boot process by executing code in ROM (specifically, the BIOS) to load the sector from sector 0, cylinder 0 of the boot drive.

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该映像不仅包含 Linux 内核和根文件系统，而且还包含典型的供 GRUB 和 LILO 使用的引导区。

The image contains not only the Linux kernel and root file system but also the typical boot sector used by GRUB and LILO.

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由于引导区是磁盘的一部分，它在开机启动时控制计算机系统。

As the guide is the part of the disk, it start-up control in computer systems.

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