Winnt and NTFS are an advanced file system in which NTFS can encrypt and compress files.
First you need to set the partition format of the removable hard disk to NTFS, as follows:
Ready to encrypt the mobile hard disk, right key properties → advanced → in the encrypted content in order to protect the data before the tick, and then click the confirmation → application → this time will pop up confirm attribute change click Confirm. This time your hard drive and files have been encrypted, if you get other computers will not be accessible to ensure the security of the hard drive.
If you accidentally left your hard drive in the office, you don't have to worry about people looking at your important files.
If the user set the hard disk encryption, if you want to reload the system must be installed before the encryption of the file to decrypt, or reinstall the system can not decrypt.