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Click the top one -> Partitioning -> Click Memory Card partition -> Minus -> Drag the Mac HD to full size and click "do" or whatever is it.
 
By "the top one" I believe Hellhammer is referring to the list item labelled "232.9 GB WDC WD2500...". Just to clear that up.
 
just drag the mac partition all the way across so that it deletes the other
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