Three disk mounting

Sory form my english!

I have one problem. When you turn the computer (mac) on my desktop (not in Finder) appears or mounts the three MyBook Live external drives (“Public” icons), but shoud be only one. Why that? I’m not a saperate drive in three partitions! The content in all “Public” folders is the same.

It’s possible that the drive is mapped several ways. Disconnect the other shares and they should be gone o.o