I dont know if it is the right forum to post my problem, on, if not please move it!

I own a 32pfl5007g/77 Smart Tv. I download some blue ray (MKV) movies and put them on my usb disck, is a WD MY BOOK 1 TB. The problem is that i plug the usb on the TV, the tv scans the drive but when finish it shows the screen with some music files and automatically the screen turns black and when you touch any button the tv goes but to the previuos source, i mean it simply closes the disc, and it happens all the time. Normal flash drives works because i even update the tv from a flash drive, but i want to see the movies but the tv wont open the drive, it keeps closing it as soon as it finish scanning.
I hope some one can help me.