Hi. When you say 'other drives' my answer below assumes you are talking about other partitions on the same hard disk.
If your hard drive has several partitions, you can use software to manage the disk space very easily. My personal favourite is Acronis disk director, but there is also one called partition magic.
These are commercial products and cost a reasonable amount of money, however if you only intend to do this once, then simply google 'partition resizer' and you will no doubt find some basic free utilities. I personally have never tried any of the free ones so perhaps someone else here can recommend one if they have used it.
By the way, messing around with partitions can be dangerous if you do not know what you are doing. Back up everything before you start. Better still, use something like Norton Ghost to do an image file of your entire hard drive off to an external USB bus powered hard drive so you can recover everything should it all go blah! (technical term :-)
Best wishes
V