Password Protection for Sandisc wireless flash drive when useing Mac or PC ?

I understand that the Wifi is protected when using the WFD , but it seems pointless to protect the Wifi if some one can just plug the WFD into any laptop or Mac and view the folder that are contained on the drive ?.

Surely it is just as important to protect the folders when the WFD is plugged into a laptop or Mac ?.

Am I thinking straight ?

I thought the whole idea was to protect our information ?