External hard drive not working

my external hard drive  stopped working suddenly.

i ran the diagnostic but it keep saying 0mb 

the model is my book 3tb

it shows up on devise manager but not on my computer

also on disk management it says disk not initialized and when i try to it says 

the request could not be performed because of an i/o device error

Try a different USB cable or different computer

it started working but the drive has become very slow

it failed the data lifeguard diagnostics and when it try to repair it it doesent repair it either.

can you tell me how to go about it 

thanks

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