BIT LOCKER DRIVE ENCRYPTION
This feature Microsoft introduces with windows -7 that helps to prevent unauthorized access to any file store on the drive.
for example:- This feature protects the HDD drive to access data by an unauthorized person.
HOW TO IMPLEMENT BIT LOCKER ENCRYPTION
* Click on the start button (and go to)------------control panel (then go to)-----------system and security (then go to)-------bit locker drive encryption.

