5. How could a system be designed to allow a choice of operating systems from which to boot?
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Answer:
Consider a system that would like to run both Windows XP and three different distributions of Linux (e.g., RedHat, Debian, and Mandrake). Each operating system will be stored on disk. During system boot-up, a special program (which we will call the boot manager) will determine which operating system to boot into. This means that rather initially booting to an operating system, the boot manager will first run during system startup. It is this boot manager that is responsible for determining which system to boot into. Typically boot managers must be stored at 8 Chapter 2 Operating-System Structures certain locations of the hard disk to be recognized during system startup. Boot managers often provide the userwith a selection of systems to boot into; boot managers are also typically designed to boot into a default operating system if no choice is selected by the user.
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