Geronimo disk footprint growth at startup

[Dave Colasurdo]

I've recently noticed that the geronimo disk footprint (on a Windows 
platform) seems to grow from 55M to 96M when the application server is 
started.  It seems that the culprit is 
\geronimo\var\activemq\journal\log-00*.dat..

What exactly are these log files?  Is there a simple way to disable this 
behavior?  Should this be disabled by default in the Geronimo v1 
distributions?

Thanks
-Dave-