External doesn't come up

I have a external filled with about 200gb+ of audio, and video files that is NTFS formatted.   I plug it in, but it doesn’t show up on my WD TV live streaming devices, though the hd is on and WD has light flashing. . After a while I do get a message that says compiling media library, which after a minute or so cause the device to freeze. Any ideas? 

If you are using an external hard drive without a power supply, be sure to use an 18 inch USB cable and avoid using a USB hubs.