Unplug the power cable from the wall outlet or the back of the PC case.
If you encounter issues while trying to add your drive, use these common troubleshooting vectors to isolate the problem: The Drive Does Not Show Up in Disk Management how to add a drive to windows 10
This comprehensive article covers the entire process of adding a drive to Windows 10, from the physical installation to the software configuration. Phase 1: Physical Installation Unplug the power cable from the wall outlet