How to Create a Dual Boot System
Dual boot system allow users to choose from among operating systems when starting their computers. Some users may need different operating systems to run certain types of software, or a computer might be shared by multiple users accustomed to specific operating systems. You can choose to dual boot on the same platform, such as two versions of Windows, or two different platforms, such as Windows and Linux.
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Instructions
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Back up all data and files before creating a dual boot system. You will be formatting the hard drive during the process.
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Install the operating system with the earliest edition date first. If installing a Windows and a Linux operating system, install Windows first. If installing two Windows operating systems, the earliest edition must be installed first. For instance, Windows 98 would be installed before Windows XP.
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Create two partitions during the first operating system installation.
Boot from the Windows operating system disk. Agree to the license agreement and wait until the partitions screen appears. This will be a DOS screen.
Delete existing partitions by selecting each one in turn, pressing "D" and then "L" when prompted.
Create new partitions by selecting the now unpartitioned space and pressing "C". Type in the number of megabytes for the partition and press "Enter" to create the partition. Repeat this step for each operating system partition. -
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Determine how large each partition needs to be. Leave room for files and applications. Each operating system should be allowed 5 GB. If both systems will be used regularly, use half the hard drive for each partition. If one system will be used more often or will contain more files and applications, split the hard drive space 60/40.
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Install the first operating system on one of the partitions and continue with the installation as normal.
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Begin the second installation. Don't touch the partition containing your first operating system. Choose the second partition and continue with the installation.
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Restart your computer after both systems have been installed. Choose your desired operating system from the boot menu.
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Tips & Warnings
When dividing the partition, create a larger partition for the operating system you will use the most.
Be careful to install the second operating system on the empty partition. You will have to repeat the entire process should the second operating system be installed over the first operating system.
