multiple /home mountpoints

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http://askubuntu.com – I have 5 hard drives 1.5TB and 4-750's. What I want to do is make the 4-750's into a raid10. I already have a /home mountpoint on the 1.5TB drive. I want to use the raid as DATA only no OS stuff at all. This will be storing movies and music for the network DLNA server/PLEX. If I mount the raid10 as /home, will all the data go to the raid drives then fill up the 1.5TB /home mount point, or will the system combine the two? What would be the best thing to do? Ubuntu 12.04LTS 64bit is installed and working great. P.S. I don't even care a single thing about Windows any more so that will not b (HowTos)