Editing Disk partitioning (section)

=== Multi-boot systems ===
{{Main article|Multi-boot}}
[[File:GRUB with ubuntu and windows vista.png|thumb|371x371px|A [[GNU GRUB|GRUB]] startup menu showing [[Ubuntu (operating system)|Ubuntu]] Linux (with three different boot modes) and [[Windows Vista]] options]]
Multi-boot systems are computers where the user can boot into more than one distinct operating system (OS) stored in separate storage devices or in separate partitions of the same storage device. In such systems a menu at [[booting|startup]] gives a choice of which OS to boot/start (and only one OS at a time is loaded).

This is distinct from [[virtual machine|virtual operating systems]], in which one operating system is run as a self-contained virtual "program" within another already-running operating system. (An example is a Windows OS "virtual machine" running from within a Linux OS.)