In a multi-boot computer each of the multiple operating systems can reside on its own storage device, or some storage devices might contain more than one operating system in different partitions. Number of operating systems per storage device Other systems provide similar mechanisms for alternate systems on the same logical drive. The user issues the BOOT command from the DOS or OS/2 command line to do the necessary copy, move and rename operations and then reboot to the specified system on C. In an OS/2 dual-boot configuration, the C drive can contain both DOS and OS/2. Technical issues Number of operating systems per volume (logical drive) Having these systems on one machine is a way to reduce hardware costs. Multi-booting is also used by software developers when multiple operating systems are required for development or testing purposes. This is often accomplished by using a boot loader such as NTLDR, LILO, or GRUB which can boot more than one operating system. A multi-boot configuration allows a user to use all of their software on one computer. Multi-booting is also useful in situations where different software requires different operating systems. A possible alternative to multi-booting is virtualization, where a hypervisor is used to host one or more virtual machines running guest operating systems. Multi-booting allows a new operating system to configure all applications needed and migrate data before removing the old operating system, if desired.
Another reason for multi-booting can be to investigate or test a new operating system without switching completely.
A common use is to enable a user to switch between a private and a work dedicated system to maintain access integrity and separation between the user environments. Multi-booting allows more than one operating system to reside on one computer for example, if a user has a primary operating system that they use most frequently and an alternate operating system that they use less frequently. Multi-booting may require a custom boot loader. The term dual-booting refers to the common configuration of specifically two operating systems. Multi-booting is the act of installing multiple operating systems on a single computer, and being able to choose which one to boot. GRUB, with entries for Ubuntu and Windows Vista, an example of dual booting
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