I’ve had my Lacie drive lock up on me when it gets too warm, and I put an oscillating fan right in front of it to keep some cool air flowing and that has worked well for me with the drive getting warm and locking up. However, I think more likely the culprit is the hard drive capacity. You mentioned that you had a couple of GB left. Taking that literally, 2 GB left on a 160 GB is definitely going to cause issues.
You typically want to keep a buffer of 10 to 15% of your hard drive empty, because as your drive becomes more and more full, the computer has to work harder to access the specific data you’re working with. Also, it will cause bad renders and all sorts of other not so fun stuff to happen. Grant it, you mentioned you had no render files on this drive, however I would still recommend freeing up some space on the hard drive if you’re going to use it as a scratch disk.
Richard Sanchez
North Hollywood, CA
“We are the facilitators of our own creative evolution.” – Bill Hicks