I have problems in computer intensive calculations, obtaining a message saying "Your Mac OS X startup disk has no more space available for application memory" Obviously, Mathematica's temporary working-file folder fills up the disk and has no more space. I asked Wolfram Research's technical support people how to change the appropriate settings in order to use a temporary folder on a second drive, that I am willing to fully dedicate to Mathematica's operation; ...they refused to let me know (?!). Can anyone guide me through the steps for re-addressing the temporary-file folder in Mathematica? I am using version 8 (same happened in version 7, though) running on a Mac Pro 2 x 2.26 GHz quad-core Intel Xeon with 12 GB Ram memory. Many thanks.