Christian showed the correct method to get the drive information, It is a matter of applying the method to how you want to display or use the information provided.
In your case, replace the
If drive_info.IsReady() Then
ComboBox1.Items.Add(drive_info.Name & " " & drive_info.VolumeLabel())
Christians example shows 3 ways to display the drive information, choose the one that serves your purpose.