And this problem can be caused by some partition issues:
You might wonders why your Windows or Mac computer does not recognize the external hard drive.
Why Does Your PC Not Recognize External Hard Drive? Part 3: The Best External Hard Drive Data Recovery Software.Part 3: How to Fix External Hard Drive not Recognized on Mac.Part 2: How to Fix External Hard Drive Not Recognized on Windows?.Part 1: Why Does Your PC Not Recognize External Hard Drive?.
