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I have a folder on Drive 1 called Music, and it is 100GB. I have a folder on Drive 2 called Music, and it is 116GB. It's the most updated version. How do I copy the Music folder from Drive 2 to Drive 1 without having to rewrite every single file?

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Which version of OS X are you using? – Nix May 13 '12 at 21:59
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I am using 10.7.4. When I copy the folder from one drive to the other, I'm asked if I want to replace. No merge option. – dallen May 13 '12 at 22:02

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The merge option will only show up if you are copying (rather than moving) the folder. Make sure you hold option while you drag the new folder to the location of the old folder. Alternatively, using ⌘+c to copy the new folder and ⌘+v to paste over the old folder should give you the option to merge the files.

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Not sure why the default Lion Merge button doesn't show up for me. But I ended up using ditto. Found here: http://superuser.com/a/221599/102789

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