Partitioning a hard disk means dividing the hard disk in multiple partitions, which will occur as C, D, E, etc in your Windows Explorer. There are some simple ways to manage your disk partitions to either expand or reduce them.
Once your disk is divided into several partitions, directories and files of different categories may be stored in different partitions. More partitions give extra control, but too many may become cumbersome. Because of later changes on the computer and operating system, often an administrator or power user will be faced with the need to resize partitions, create new partitions in the unallocated space, and sometimes even undelete partitions that were previously removed or deleted.
How to Resize Partitions on Your Hard drive?
Method 1: Reinstall XP from a bootable CD and create an install partition that is smaller than the total capacity of the hard drive. Of course this method has a very substantial downside; everything on the hard drive, including data and applications, will be lost when the drive is formatted. While this method is effective it’s only practical in a limited set of circumstances, unless of course you enjoy wiping a hard drive totally, designing a partitioning scheme in your mind, and then setting it up from scratch.
Method 2: Use a program that is designed to handle partitioning tasks from inside the existing Windows operating system. The best known program of this type is probably PartitionMagic by PowerQuest, although there are many others including PartitionExpert by Acronis and Partition Commander by V Communications. A Google search will turn up many others as well as some free utilities to accomplish the same results.
Source : B4tea.com