Missing music

I bought a WD CLOUD product to store all my music cds. All was working fine but after some time I went back to sync my music only to find most of the folders that contained my music had a desktop.ini file and no music in them.
Not all the folders have this but propably 80% of my music is gone now! What is going on! How can this product be so unreliable! I am talking about loosing 100s of pounds worth of cds. Surely this is not right