Mystery device(s)

I have no devices attached; still, when the import window open, these 2 shows up. Any idea what they are, and what function they have

Speculate ..

They're network connections.

its part of the OS X auto mounting system. Its mostly used for networked computers that mount a users home directory from a file server or other machines. They are normally hidden from view.

No speculation needed

Home and net are root-level Unix folders that normally don't show at Finder level unless you have "show hidden files" activated. They are the root directories commonly used when you connect your Mac to an NFS network. Users' home directories are usually mounted under /home, and other shared filesystems under /net.

FCPX goes very deep in the OS, and sometimes it can show these folders in the Import window although they are not useful to you. I wouldn't bother about them. Sometimes they show, sometimes they don't. If you see them appear in Finder you can hide them with a Terminal command. But if you are not familiar with the Terminal it's not worth the trouble.

- Ronny

ok thanks guys Mystery solved