I get some interesting questions sent my way, and this weekend was no exception. A long-time About: Macs reader wondered if it's possible to resize a disk partition on his Mac without losing any data.
Seems he needs more room for his ever-growing library of images. He originally split a disk into multiple partitions, but as his collection of pictures grows, the image library partition is fast running out of room. Luckily, he has another partition on the disk that isn't really being used, and he's willing to give up that partition, or at least steal some room from it.
I sent him off to peruse the Disk Utility - Add, Delete, and Resize Existing Volumes With Disk Utility article, which contains step-by-step instructions for resizing a disk partition.
There are a few restrictions for resizing a disk partition, and it's a good idea to know what these restrictions are when you first plan to partition a hard drive. If you know the restrictions in advance, you can probably get away with resizing a hard drive partition later, if the need arises.