External harddrive doesnt appear in my computer. It comes up Unknown in disk managment

[skyfalls]

My laptop will not recognize my external harddrive. It doesnt show up under my computer. I tried to go thru R click my computer and manage it but it doesnt appear as a known device.

 

[Alican Avcar]

Go to manufacturer web site, there should be drivers/software, download and install them.
If it doesn't work, I'm afraid your external drive is broken, you might try to open case and use it as internal drive to see if the problem is the external box.