Issues with external storage can be frustrating, which is why it helps to know how to fix an external hard drive that's not showing up ... hard drive from being recognized. Update the drivers ...

The first thing to check with any external drive when Windows doesn't recognize it is the power source ... is preventing it from mounting. If you're not getting any indication of its presence ...

I have a 4 TB USB external drive that used ... yellow exclamation mark. It does not show under Disk Management. Tried on another PC but same issue. Is the drive done?

Although sometimes this problem gets fixed by re-inserting the USB drive – if it is not being solved ... Open Disk Management, right-click on the external drive, select Delete Volume option.