New LaCie d2 Quadra and New MBP - Prompts to install Rosetta??

New MBP running Snow Leopard (2 weeks old) + new LaCie d2 Quadra 1 TB (2 days old). Just ran into a curious issue. I need some guru help. Plugged everything in and intended to do my first Time Machine backup. The LaCie set-up assistant causes this message to appear: "To open LaCie Setup Assistant, you need to install Rosetta. Would you like to install it now?" No I don't want to install Rosetta. Does this mean I need to format the LaCie external drive? I never had to do this on my old MBP or with countless other (older) LaCie drives. If I HAVE TO reformat the LaCie drive...ummm...could someone talk me through that process? Or point me to a page that gives a step by step guide? This should be easier. Thanks.