Use rsync to copy the contents of one hard drive to another on a mac.

A couple of snippets that I use to sync files from one external drive to another.
# Dry run
rsync -ruvn --delete --stats --exclude="/.*" --exclude="/RECYCLER*" --exclude="*.DS_Store" /Volumes/jeffystorage/ /Volumes/seagatefreeagent1TB
 
# Real deal
rsync -ruv --delete --stats --exclude="/.*" --exclude="/RECYCLER*" --exclude="*.DS_Store" /Volumes/jeffystorage/ /Volumes/seagatefreeagent1TB

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