[Zope] Where does Zope store HTTP file uploads?

When I do a file upload to a Zope method where is the temp file stored on the server? /tmp, /var/tmp, or the directory containing Data.fs? I need to know this because the system we're setting up will receive large file uploads and I need to dimension the partitions correctly. Thanks -- Farzad FARID <farzy@via.ecp.fr> Ingénieur Informatique Libre Alcôve - http://www.alcove.fr/