模拟centos6.9系统MBR故障
centos系统启动分2个阶段1、MBR
1.5、MBR之后的扇区
2、磁盘引导
我们只对MBR进行破坏，全程在虚拟机环境下进行。
首先将数据覆盖至硬盘主分区446字节
dd if=/dev/zero of=/dev/sda bs=1 count=446 //主要是破坏硬盘的引导
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这时系统无法引导，当我们挂载光驱时，系统会自动把光驱当做引导。
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