There is an excellent program available for this called "partition magic." It is pretty much the only way to re-size partitions without having to format & thus losing the data. Its not free, but it is pretty cheap for as good as it is.
The link below will take you to a list of freeware & shareware programs which also may be able to help. But remember, when working with partitions tread carefully, one wrong click and its all gone.
Incorrect: While partition magic will do what you want it is by no means the best nor is it the only option. The best and free option is to download almost any of the Linux live CD's and use their program called g partition. Don't be afraid of this because it is "Linux". It is just as easy to use as windows, I swear. There is even a special Linux that only has g-parted on it, it is extremely small and can run from a usb drive or live CD. G-parted is better because the hard drive in question does not even have to be bootable in order to use it, plus it is free. Also it can format into both NTFS and Fat plus the Linux formats so you can use it to make drives for Mac or Windows. It is awesome check it out.
Is this a new question? Personally I'd like to partition my hard drive to two partition, one for system and apps, another for data storage: here is an article about how to partition hard drive with Aomei Partition Assistant, may be could help: http://www.extend-partition.com/resource/how-to-partition-a-hard-drive.html
The ability to partition hard drives can provide a range of benefits. But removing a hard drive partition can be difficult if you don't know what you are doing. With a few simple steps, this article will show you how easy it is to remove a hard drive partition without losing information or potentially damaging your drive or OS installation.
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