In this post i will show how to create VHD ( virtual harddisk ) in your system . And we will also learn how to secure our virtual harddisk . You might be thinking what’s virtual harddisk how it works ? Virtual harddisk is file format which you create using your system physical harddisk . For example , I’m having D drive of 300GB and i want vitual harddisk of 100GB , so we will take the space of D drive and create vhd (virtual harddisk) of 100 GB .