Thanks everybody. I just bought this thing and plan on learning about it on my 9+ hour flight. No time to read the book yet.
Looks like 12gig of cards is enough! That's my problem, always over the top.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport