My external hard drive started making a buzzing noise

Today when i tried to play on my ps4 i could access any of the games i had downloaded on it and it was making a humming/buzzing/beeping noise. I have dropped and unplugged it without disconnecting before, what do i do, its been disconnected from my playstation so there is no power going to it. Will there be any data loss? The data is important seeing every game/dlc ive ever downloaded is on it, however i did check and it seems psn automatically backed up my game storage, but to be clear when i downlod a game on the external hard drive what all goes on it?