Please change your code as shown, then "run" it. The Immediate window should contain several lines of text after this that show the values of your variables. Please post those lines back here.
Call sListAllDrives
Debug.Print "Tremoveable = " & Tremoveable
Tdrive = Tremoveable
Debug.Print "Tdrive = " & Tdrive
sPath = Tdrive & ":\RnRGear"
Debug.Print "sPath = " & sPath