[Zope] Disabling Undo

Hi, How I can disable the Undo in Zope? I have one Forum in Zope, but my Data.fs stays with 500Mb every day. Than i have 2 options: One is Pack, 4 or 5 times a day... or i disable Undo. Then i can stay with 100~150Mb. Can anyone help me? -- Ricardo Guimarães ricardo@conectiva.com.br http://ldp-br.conectiva.com.br