How to delete an attached source

How to delete an attached source

Hi all, beginning to use Peakto I attached a lot of folder (with my pictures) located in an external HDD, named let say VOLUME1. But since, I had to rename my external HDD, so I attached again the same folders but with another volume name, let say VOLUME2. The result is that I have all my attached folders in double. How can I proceed to delete the attached folders with the wrong volume (VOLUME1)? Thanks for your help