I am running an iMac with Snow Leopard and Lightroom 3; both the OS and program are installed on a 120GB SSD (I know the setup is a bit dated but bare with me)...
I edit about 4-10GB of RAW files every week, which are stored on a separate 2TB HDD, yet somehow, every week I keep seeing less and less available space on my main SSD drive, now down to only 6GB and I don't have much installed on that drive.
Is there a setting or something I can do to fix this?
The folder that contains your catalog and preview files and other relevant user files is still on your SSD. You can move that entire folder to your external hard drive. After you move it, simply open it in its new location and double-click on the catalog file to start Lightroom.