If you find the external hard disk showing up in Disk Management as unallocated/not initialized/offline, it would be easy to fix the external hard drive not recognized problem (refer to Method 2: Check & Fix the Drive in Disk Management below). This is not a rare issue it has ever happened to many people and will be happening to more. Some people even reported that the external hard drive is showing up in devices but not in my computer. Whether you're plugging in a new hard drive or an old one to your computer, it is possible that you can't see it. How to Fix: External Hard Disk Detected But Not Opening.Method 10: Repair the System Built-in Drivers.

Method 9: Install the Latest Chipset Drivers for Motherboard.

Method 8: Disable USB Selective Suspend Setting.

Method 7: Install the Latest Windows Updates.

Bonus Tip: How to Recover Files from External Hard Drive Not Detected.

Method 2: Check & Fix the Drive in Disk Management.Method 1: Turn to Different USB Port or Computer.Please read this page offered by MiniTool to know how to access the drive without data loss. There are some useful fixes to the external hard drive not detected on Windows 10. The external hard drive not showing up problem occurs frequently on Windows PC or Mac, and it could lead to data loss. Sometimes, when you connect an external hard drive to your computer, you may find it fails to show up.

Windows 10 portable apps not working