Assuming the partition is a supported format:
-You can enlarge to however much free space you have up to the maximum supported by either partition format or partition map type.
-You can usually shrink to a size just a few MB over your current data on the disk.
You cannot do any of this while the disk is mounted.
@theos911: OK, thanks for the follow up . . . all the Mint partitions were created in GParted . . . and somehow this 263 MB partition was created and is now Free Space, but I haven't been able to expand the main partition to use the Free Space, even when booted up in the Mint install disc as I mentioned . . . or even using GParted when booted up in a LiveDVD . . . . It's hard to know what the installer disc means when it says, "all changes have to be written to the disc before the partition can be modified" . . . does that mean all the steps in the installer that went on before the disc partitioner part? Or would that just refer to the few different decisions made in selecting "manual" over "Guided" and so forth? In theory I'm using only 3.6 GB of a theoretical 4.8 GB partition, but when I tried to download a 697 MB file when it got to 300 MB an error window opened saying, "there is only 200 MB available" . . . so it reduces the system to just being able to support itself w/o room for any other data in the home folder . . . like for photos, tunes . . . it's more or less just a terminal to access the "cloud" at this point.