Because most disk devices use a sector size of 512 bytes, the first-stage boot loader code must be very small.
由于大多数磁盘设备扇区大小为512字节，因此第一步引导加载程序代码都很小。
If the disk is bootable, the first sector is called the boot sector, since this is where the boot loader code resides.
如果这个磁盘是可启动的，那么第一个扇区被称为启动扇区，因为这是启动引导代码存在的地方。
The first 446 bytes are the primary boot loader, which contains both executable code and error message text.
前 446个字节是主引导加载程序，其中包含可执行代码和错误消息文本。
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).
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）。
A lot of the hardest work in x86 systems is building the tiny little block of code that loads the real boot loader; a more flexible BIOS could do that work and make the problem go away.
x86系统中很多最为困难的工作是构建小型的代码块来加载真正的引导加载程序；更灵活的BIOS可以完成这种工作，并解决这个问题。
Code from a boot loader such as LILO, which locates the kernel, loads it, and executes it to start the boot proper.
来自加载程序，比如LILO的代码，该加载程序定位、加载并运行内核以开始正常引导。
When the boot loader is invoked (the BIOS automatically executes the code in the MBR), it usually displays a menu of possible OSes to boot.
调用引导加载程序时(BIOS自动执行mbr中的代码)，它通常显示可以引导的OS的菜单。
When the boot loader is invoked (the BIOS automatically executes the code in the MBR), it usually displays a menu of possible OSes to boot.
调用引导加载程序时(BIOS自动执行mbr中的代码)，它通常显示可以引导的OS的菜单。
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