[jitter] jit.qt.record

I have a question:
what would be the best way to render out a movie using the 'write'  
command (using the jit.qt.record object) to another volume?
I tried entering an absolute path in front of the filename but  
nothing happened:
/Volumes/myhd/video/mymovie
is there some other way to write out a movie to a volume hanging off  
the root?

config:
OS X 10.4.11
G4 PB 1.67GHz
=========
Max/MSP 4.6.3
Jitter 1.6.3
Pluggo 3.6.0
Soundflower 1.2
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