I have two drives on my Mac which are always empty (I've enabled show hidden files in the Finder):
What are these drives for?
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Not sure why you're always seeing them -- I don't, even with hidden files enabled -- but they're the root directories commonly used by the automounter when you connect your Mac to an NFS network (which generally means a Unix/Linux network). Users' home directories are usually mounted under /home, and other shared filesystems under /net.