The hidden files/folders will be safely hidden whether the drive is accessed in another operating system on the same computer or reinstalled on another computer. The only way to access hidden files/folders/USB is to enter your password(s) correctly.
With Wise Folder Hider you will get your private and important data double password protection. This freeware also supports drag and drop, hides files/folders by right-click when Wise Folder Hider is closed. And it can hide your data from a removable device.