First, the first ready system installation disk, use the installation disk:
Select: Troubleshooting 
Second, enter the Troubleshooting interface
selection: Rescue a CentOS Linux system
Three: the option to enter the Rescue and press ENTER Option 1
1) the Continue: rescue mode program will automatically find an existing file system, system, and can read and write to mount under / mnt / sysimage directory.
2) Read-Only: will be read-only way to mount an existing file system.
3) Skip to shell: manually mount
Four: Check whether the system is successfully mount (under the old directory / Home / Soft)
#cd / mnt / sysimage / Home