遗憾的是，许多需要主分区的操作系统都不能从GPT磁盘引导。
Unfortunately, many of the operating systems that require primary partitions are unable to boot from GPT disks.
有些操作系统，比如Windows，必须从主分区引导。
Some operating systems, such as Windows, must boot from a primary partition.
MBR中的主引导加载程序是一个 512字节大小的映像，其中包含程序代码和一个小分区表（参见图2）。
The primary boot loader that resides in the MBR is a 512-byte image containing both program code and a small partition table (see Figure 2).
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.
分区表位于磁盘主引导记录（MBR）之中。
The partition table is located in the master boot record (MBR) of a disk.
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.
必须有一个分区格式化为0x41 (PRePBoot)可引导类型的主分区。
It must have a partition formatted as a primary partition of type 0x41 (PReP boot) bootable.
这种现象称为链式加载(chain loading)，通常发生在位于主引导记录(MBR)中的引导管理器加载一个分区引导记录中的启动加载程序的时候。
This is called chain loading, and it most frequently occurs when the boot manager that is located in the master boot record (MBR) loads the boot loader that is in a partition boot record.
可以从支持的设备(如软盘驱动器、CD、USBkey或主驱动器上的微小分区)执行初始引导步骤，然后使用外置驱动器进行其他操作。
You can perform the preliminary boot steps from a supported device such as a floppy drive, CD, USB key, or a tiny partition on the main drive, and then use the external drive for everything else.
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.
硬盘软故障的数据恢复主要可以从以下几个方面入手：主引导区恢复、分区表恢复、DBR修复零磁道损坏的修复以及文件误删除的数据恢复。
The data recovery of hard disk software failure can be solved by the following ways, the recovery of main boot partition, partition table, DBR, zero track and the file deleted by mistakes.
硬盘软故障的数据恢复主要可以从以下几个方面入手：主引导区恢复、分区表恢复、DBR修复零磁道损坏的修复以及文件误删除的数据恢复。
The data recovery of hard disk software failure can be solved by the following ways, the recovery of main boot partition, partition table, DBR, zero track and the file deleted by mistakes.
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