In (1), you specify that the find command is to search in the pwd. In (2) and (3), the find command is supposed to search in the /white directory which does not exist. In fact, it clearly says that in the output doesn't it.
To make (3) work, run the command as:
Code:
guests-Computer:/volumes guest$ pwd
/volumes
guests-Computer:/volumes guest$ find white -type d
Assuming that 'white' is a directory inside /volumes, the command will work.
