Right-click the "Unallocated" space on the new drive and select New Simple Volume . Follow the Wizard: Click Next, accept the maximum volume size. Assign a drive letter (e.g., D:).
Option B (DVD/CD Bay): Replace your old optical drive with a 2.5-inch hard drive using a hard drive caddy. Replace the panel and turn on the laptop. Step 3: Initialize and Format the New Drive in Windows 10 how to install a second hard drive windows 10
Once finished, your second hard drive will appear under "This PC" in File Explorer, ready for use. Pro Tips & Troubleshooting Right-click the "Unallocated" space on the new drive