[Zope] zope file system limits

I am running a zope server on which I store a lot of 5+ MB files on the zope filesystem. When one of the users tried to upload a 28MB file today, she got a Error 28 insufficient space. There is sufficient space on both the data and root partitions that the zope server lives on, so I don't think that is the problem. Does the zope filesystem have size limits that are in the range of 30MB? Thanks, John Hunter Zope 2.5.1b1 (source release, python 2.1, linux2), python 2.1.3, linux2