WD My Cloud External Hard Drive 6TB WDBCTL0060HWT-AESN

I have the above External Hard Drive- its connected to my Desktop Tower- Access via Network. This (EHD) is the "Main Source Hard Drive" for all my devices backup's and where all my downloads eg: Movies and Music ect. are all sorted.

There is a "2nd" backup system in this called "Safe Points"- but thats a different issue there !!

What my Main Concern is; I had a "large amount" of movies and music - that I moved from my desktop tower to my EHD, to save on space, and I always thought I did have a copy of all saved else where- but I was wrong.
Moving Forward; there was heaps of pictures/double up's ect of other files- which I still have copy's of on my desktop - so my main concern is instead of wasting hours sorting and deleting I did a "Factory Reset" then would transfer back on 1 by 1 ect.

But as I don't have a "backup OR saved a copy of the movies and music folders - Iv LOST them all; is their a way or program that I could use- would like it too be free if possible- that I could DL, connect the EHD to my laptop and let it scan ect and it to be able to retrieve all that was on there (as of today 06/07/2016)

as I reset it- other devices are connected back to it- as per before FYI

Can anyone help- Im devastated on how stupid I was for not "double checking" before Factory Reset.