I cannot see my phitis on my pendive

Hello,

I downloaded my photos from my camera onto my pendrive (Kingston 8GB) and subdivided the main folder in many subfolders but now when i open my subfolders my photos are not here.

My main folder's name is 100_PANA and the subfolders names are Hanoi, Singapore,Cambodia.

Please help me coz i really need those photos

Thanks

kris