这个只跟硬盘有关，跟操作系统是什么没有关系。主引导记录告诉机器从哪里启动系统，所以一般来说主分区是安装系统的。
This limitation is due to something called the Master Boot Record which tells the computer which partitions it can boot from, and so primary partitions are usually reserved for operating systems.
现在键入root (hd0, 0)(或者是你自己得到的返回值)，以告诉Grub该从哪个分区启动，然后键入setup (hd0)以在你的硬盘主引导记录重新安装引导程序。
You should now type root (hd0, 0) (or your equivalent) to tell Grub which partition is being used to boot from, followed by setup (hd0) to reinstall the boot loader into the disk's master boot record.
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。
Commonly, Linux is booted from a hard disk, where the Master boot Record (MBR) contains the primary boot loader.
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。
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.
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。
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.
被称为“Mebroot”的rootkit感染硬盘主引导记录(MBR)，即个人电脑硬盘的第一个扇区，电脑在装载操作系统前会在这里寻找(主引导记录)。
Dubbed "Mebroot," the rootkit infects the master boot record (MBR), the first sector of a PC's hard drive that the computer looks to before loading the operating system.
被称为“Mebroot”的rootkit感染硬盘主引导记录(MBR)，即个人电脑硬盘的第一个扇区，电脑在装载操作系统前会在这里寻找(主引导记录)。
Dubbed "Mebroot," the rootkit infects the master boot record (MBR), the first sector of a PC's hard drive that the computer looks to before loading the operating system.
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