Partition management

The following concepts and activities can help you manage your disk partitions.

Set an active primary (boot) partition. When you create multiple primary partitions with different operating systems, you must tell the computer which primary partition is to boot from. The primary partition from which the computer boots is called the active partition. If there is no active primary partition on the first physical hard disk, your computer will not be able to boot from your hard disk.  

Before you set a primary partition active, make sure that it is a bootable partition. Bootable partitions are logically formatted and with the necessary OS files installed. Partitions without an OS cannot be booted.

By creating an extended partition and then dividing it into logical partitions, you can:

Access the Same Files from Multiple Operating Systems  
Make Efficient Use of Disk Space  
Simplify File Access and Enhance File Security