Thank you Reborg. Since this is a dummies group, could you explain why number (1) works but numbers (2) and (3) don't work?

(1)
guests-Computer:/volumes/white guest$ pwd
/volumes/white
guests-Computer:/volumes/white guest$ find . -type d
.
./pho_pp
./pho_pp/Test_dir
./pho_pers
(snip)

(2)
guests-Computer:/volumes/white guest$ pwd
/volumes/white
guests-Computer:/volumes/white guest$ find /white -type d
find: /white: No such file or directory

(3)
guests-Computer:/volumes guest$ pwd
/volumes
guests-Computer:/volumes guest$ find /white -type d
find: /white: No such file or directory