External hard drive showing up in Disk Management (is detected) but not accessible.External hard drive not showing up in Disk Management.

Open Disk Management (Open Search box > type diskmgmt.msc > press Enter) to check if your Seagate or other external hard drive shows up there. What to do first when you can't see the external hard drive on PC This post is useful for fixing Toshiba, Lacie, Sonnics, WD, Hitachi, Seagate, and other brands external hard drive that's not working or showing up on Windows. Besides, this post also contains solutions for the external hard drive detected but still not visible. Here, we'll tell you how to troubleshoot the external hard drive not showing up on your Windows 10/8/7. Why is my external hard drive detected but cannot open? It shows up as a device in device manager but I don't know how to open it. I have an 80GB Seagate external hard drive that I connect to my Windows computer to store files but for some reason, just recently, it has stopped showing up in the 'My Computer' folder. But if it doesn't show up, you might be in a trouble.

Usually, when you plug an external hard drive into your computer, it will appear in your File Explorer.