new hard drive

[Dufgolfer]

OK guys, I went to my computer clicked on my old hard drive, right clicked on the folder with my songs, selected copy, went to my new drive, right clicked, selected paste and it worked. I checked it and all is well with it. Then I disconnected it, went to hoster and picked a song from my data base, clicked on add track and got the message "was not found on the hard drive". I went to my computer, clicked on my old hard drive, selected the folder and all my songs are still there. Why doesn't hoster see them? What do I need to do?