Commonly, Linux is booted from a hard disk, where the Master boot Record (MBR) contains the primary boot loader.

通常，Linux都是从硬盘上引导的，其中主引导记录(MBR)中包含主引导加载程序。

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A hard disk is different. A hard disk has an MBR (Master boot Record), this is because a hard disk can have multiple partitions and any one of them can be bootable.

硬盘则不同。硬盘有一个MBR(主引导记录)，这是因为一个硬盘可以有多个分区，并且其中的任何一个分区都可以是可启动的。

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The master boot record of hard disk, the programming method for the copying and restoring CMOS parameters, and realizing the writing protection of hard disk is represented.

论述了硬盘主引导记录、CMOS参数备份与恢复的程序设计方法及硬盘写保护的实现。

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