Winmend is freeware program which allows you to hide folders in windows, it can help you hide the folders not only on local hard disk but it can also hide folders on your USB Flash drives and other removable devices. You can set a password for using this application so that no body other than you can see the hidden folders through this software.
Once you install this program on your computer, it will ask you to set the password which should be of minimum 6 characters and maximum 15 characters, as shown in the image below.
You can add the folders to hide by clicking the button on the top right of the application interface to lock any folder and make it invisible and inaccessible.
The data is completely invisible to other programs or on other operating systems, but this software is recommended for home users only not for commercial users with high sensitive or confidential data on their computers.
Note: We were really impressed by the hiding speed of hiding a folder with this application, irrespective the size of folder and its contents.