推荐回答（3个）
答：主板一般拥有两个IDE接口，可分别连接两条IDE数据线。而每条IDE数据线上有两个IDE接口，可分别连接两个IDE设备，这两个IDE接口，就分别是"Master"（主盘）接口和"Slave"（从盘）接口。
顾名思义，"Master"（主盘）就是系统启动首先读取并引导的盘，对于装有操作系统的硬盘来说，最好将它设置为"Master"（主盘），这样系统才能被正确引导。
同时，需要指出的是，在一条IDE线上，仅能同时拥有一个主盘，一个从盘。在同条IDE线上接两个主盘，或两个从盘的做法都是不可取的，应通过更改硬盘跳线的方式纠正过来。通过跳线设置主盘和从盘的方法，每个厂家都有各自的标准，大家可以在IDE设备的盘面上，找到相关的图注或标志。一般情况下，"Master"的简写是"MA", "Slave"的简写是"SLA"，在IDE设备电源接口旁边，找到MA或SLA的标注，将其下方的两根跳线针用跳线帽接通，就算开启了相应的模式。
master 英 ['mɑːstə] 美 ['mæstɚ]
vt. 控制；精通；征服
n. 硕士；主人；大师；教师
adj. 主人的；主要的；熟练的
slave 英 [sleɪv] 美 [sleɪv]
n. 奴隶；从动装置
vi. 苦干；拼命工作
例句
Have you horsed your master?
你给你主人备好马了吗?
The puppy was fawning on its master.
小狗向它的主人摇尾乞怜。
The dog has transferred its affection to its new master.
那狗已把它的感情转移到新主人身上。
He leathered the slave black and blue.
他用皮鞭把奴隶抽打得浑身青一块紫一块。
They affirm some personal rights for the slave, but not all.
他们肯定奴隶有一些人权，但不具备全部的。
He was a slave ten years ago and was ransomed later by an old rich woman.
十年前他是个奴隶，后来被一位有钱的老太太用钱赎了出来。
Master就是主盘的意思，Slave就是从盘的意思
因为我们大多数启动会设置为主盘来启动，相对应的在CMOS BIOS中会有一个设置，也就是第一启动硬盘，通过CMOS的设置Master可以正确引导我们的系统，如果你没有设置好我们的硬盘Master和Slave，电脑无法认出那个是你要做为系统的硬盘，当然如果你电脑中只有一个硬盘，那么就无所谓了。
如果是二个硬盘就必须设置一个为Master，一个为Slave，否则可能在CMOS中会认不到其中的一个或全部认不到，这就我们要求通过设置Master和Slave的跳线来设置，具体的设置方法可以看看硬盘上的说明标志，如果要设置为Master就把跳线按图设置到Master位置上
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