Nothing you can do other than a sledgehammer will touch the VW hidden bits, as I understand it so you should be ok. Actually, its not a partition, it's the CID of the card, I believe. Which cant generally be touched or overwritten.
On mine, I copied the contents off, deleted what was there (not formatted), then just copied the new stuff on matching the folder structure of the old.
I did use a PC though, so hope the Mac doesnt offer a further complexity. So no promises.
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