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- Aug 17, 2013
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I presently use an old Mac Mini running Snow Leopard to (1) keep all my programs on the internal HD, (2) all my data on an external HD & (3) a backup of data on a second external HD. These external HDs are, of course, formatted using Snow Leopard. If I upgrade OS to Maverick, will I need to reformat the various HDs and, if so, won't that cause me to loose all my data and programs?