Partition Type

Partition Type	Description
Active	A disk can have only one Active partition. The active partition is a Primary partition that contains the operating system (Windows) that starts when you turn on the computer.
Primary	A disk can have up to four Primary partitions or three Primary partitions and an extended partition containing logical drives. Primary partitions generally contain operating systems. Multiple Primary partitions are used when you have more than one operating system on the same computer.
Logical	A disk can contain up to 23 Logical Drives. Windows cannot be started from a logical drive so these drives can only be used to store data not operating systems.

By default the original partition type is selected. However, this may not be possible in all cases. Certain rules apply to the placement of partitions on the hard disk. Including the total number of primary and active partitions (as explained above) and the fact that all logical partitions must be in a contiguous area on the disk called the 'Extended Partition'.

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