I'm not sure but I think I may have found how to fix this. I had the same problem. Login under your user name, go to Device Manager on the left of the screen, then -> Device Profiles and then select your profile from the list. In the next window there should be an option where you have the ability to change the amount of HD space allocated. Afterwards, save the changes.

The client will update next time it talks to the server having completed the current task.

As others have mentioned, you can adjust the maximum disk space usage that the Agent should use by going to your Device Profile on the WCG web pages. The Agent will receive changes to the Device Profile sizes the next time it connects to the server.

The amount that you specify for the Device Profile is used to control the disk cache that stores the molecular files that are received from the server. Not all of the files the Agent downloads for each Workunit are different every time, and allowing the Agent to cache more files may reduce the amount that must be downloaded again in the future.

well at least i found what i was looking for, what is this program doing with all the space and how much should b considered suffcent (sp?)???