Buffalo external hard disk problem

Good day everyone.

I have 500gb Buffalo HD and the problem is that when I plug it in my laptop it makes a clicking noise then after a while the noise stop. And also it does not appear in Computer,it was only appearing in the control panel. I tried disk management and other software to retrieve and solve this but it doesnt work. Can I still recover my file without going to retrieval company? can I still save my hard disk and use it again? thanks
 
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