In conclusion, you cannot access the internal or external storage space in Windows 10. The newly-installed hard drive is invisible in Windows 10.The second hard drive is not detected in Windows 10.The external hard drive not showing up in Windows 10.The internal hard drive not showing up in Disk Management.Read and check if you encounter the same problem. Here are some frequently reported questions about hard drive not showing up in Windows 10. Top 5 Methods to Fix Your Hard Drive Not Showing Up in Windows 10