I googled for some answers to my problem and I kept reading about the error-checking tool (Properties > Tools > Check Now) so I performed that. Then yesterday the same thing happened, but this time I could not delete or create any folder inside my WD HDD.

My simple solution at first was to re-plug my external HDD (via USB 2.0) and everything became OK (songs would play correctly). Two days I ago I started to notice that some songs wouldn't play halfway through, or sometimes when I put some songs to play on VLC, it would instead play a video which I have somewhere in my external hard drive as well but in a completely different folder location. For the past week I have been doing nothing but only tagging my music files which I have in my Western Digital 1TB HDD. Hello people! Today I really need your help.