Thumb drive recognized but not WD drive

I have used my WD portable hard drive in the past with ATV without any issues now for some reason NITO TV will recognize my thumb drive but not my WD external hard drive. I didn’t change anything…All I did was unplug it take it with me on vacation to watch movies on my PC and now NITO TV will not see it…Help!!

You may try restarting the AppleTV and connecting the drive after the main menu appears.