It is impossible to disable the Task Board.
GreenHopper is quickly moving towards all the features being in the Rapid Boards, and I would recommend you adapt your workflow to these rather than using the Classic Boards if possible.
If you still feel that you would like the option to hide the Rapid Boards, then I encourage you to file a ticket in the GreenHopper issue tracker here: https://jira.atlassian.com/browse/GHS
Atlassian Support - San Francisco
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