this is take from help files:-
To create a partition or logical drive
Using the Windows interface
Open Computer Management (Local).
In the console tree, click Disk Management.
Computer Management (Local)
Right-click an unallocated region of a basic disk, and then click New Partition, or right-click free space in an extended partition, and then click New Logical Drive.
In the New Partition Wizard, click Next, click Primary partition, Extended partition, or Logical drive, and then follow the instructions on your screen.
To open Computer Management, click Start, and then click Control Panel. Double-click Administrative Tools, and then double-click Computer Management.
You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.
You can create primary partitions, extended partitions, and logical drives only on basic disks. You should create basic volumes instead of dynamic volumes if this computer also runs MS-DOS, Windows 95, Windows 98, Windows Millennium Edition, Windows NT 4.0, or Windows XP Home Edition.
On a master boot record (MBR) disk, you can create up to four primary partitions, or three primary partitions and one extended partition.
On a GUID partition table (GPT) disk, you can create up to 128 primary partitions.
For GPT disks you can specify a partition type GUID for the partition you want to create: