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.

youdao

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.

youdao