Hi
create a variable to hold the drive you want to loop over
open the "foreach loop" container ensure the enumerator is set as "Foreach File Enumerator"
under the "expressions" click the elipses in the popup select "Directory" (i think it is) and click the expression elipses
form the variables folder drag your previously created variable to the expression box at the bottom
Job Done... hope it works (hope I remembered all that correctly ;))