If you find the PC only have one drive only, it's because another drive have not been allocated. Please follow below step-by-steps to create a new volume for the new drive.

Step1. Right Click the Windows Icon and select DISK Management.( For Windows 10/Windows 11)



Step 2. You will see a Disk which is marked unallocated. Right Click the unallocated disk.



Step 3-1. Select New Simple Volume, follow the directions.


Step 3-2. Click Next.

Step 3-3. Click Next.

Step 3-4. Click Next.

Step 3-5. Click Next.

Step 3-6. Click Finish.


Step 4. You will see a new volume and it will also show on This PC.