My passport is not show my files

 well i had my passport for like a year now>>>and now when plug it to my mac  is now show my file @ all but it show the space available and it all their i really need help>>>>

Can you provide more information, like, how did you put the files in the drive, using a backup software or manually, also what OS are you using…

i had copied this file from another wd harddrive so i did it manually but the files were their all this time and now i plug my WD are not their>>>.my Mac OS X is Version 10.6.6 so can some tell me why this happen