How do I boot into rescue mode?

Rescue mode provides the ability to boot a small Linux environment entirely from CD-ROM, or some other boot method, instead of the system’s hard drive.
As the name implies, rescue mode is provided to rescue you from something. During normal operation, your Linux system uses files located on your system’s hard drive to do everything — run programs, store your files, and more.
However, there may be times when you are unable to get Linux running completely enough to access files on your system’s hard drive. Using rescue mode, you can access the files stored on your system’s hard drive, even if you cannot actually run Linux from that hard drive.
To boot into rescue mode, you must be able to boot the system using one of the following methods[1]:
· By booting the system from an installation boot CD-ROM.
· By booting the system from other installation boot media, s