If this didn’t help, proceed to the next step.

If this helped, then you were dealing with an incompatibility between the external hard drive and a specific computer’s OS. If the external hard drive is not showing up on Windows 10, connect it to another computer, even one with a different operating system. This USB port may be damaged and not working or, alternatively, there is not enough power to detect an external hard drive. Try connecting it to a different USB port on the same computer. If the external hard drive is not showing up, perhaps the problem lies in the USB port itself. Try all remaining USB ports or another computer If not, read on and you will find a solution to this problem. If this advice helped you, congratulations! You don't need to do anything else. Now check to see if the external hard disk drive is already on. In this case, first, connect the external hard drive to a different outlet or try connecting a different cable. Maybe you have a special power cable or physical power switch. Of course, almost all external hard drives are powered via USB. If your external hard drive is not showing up, before you take any action, you need to know if your external hard drive has a separate power source.

How to force format external hard drive