I use the tool hidesfiles for a few years now. It can be downloaded and tested from http://www.hidesfiles.com/
. It is fully functional, but restricted to 10 files alltogether.
After testing it costs $ 40.
Please look up the site, read the FAQ and descriptions. This is by far the most convenient and powerful tool I have seen so far. No admin rights, no hassles, the prog can be installed on several machines and any hidden files (on usb or hdd) can be made visible no matter on which machine the files were hidden in the first place. Without the tool and the created account, files stay hidden, no matter what OS you use to access the hdd or stick.
I can't reccomend it enough. If you have questions, write me, though I usually browse my pms once a month (when I get notified about the new newsletter). Though one of the real great sites, I have no time to visit it regularly.
Best from Berlin, Germany