And since an external hard drive can always get stolen, or you may lose it, it makes sense to protect the data and information inside the hard drive by using software that will let you encrypt the data efficiently. Individuals and companies alike try to find ways to protect their data. You should encrypt your data if you are storing it on multiple devices.Before getting into the ways to add a password to an external hard drive, let’s find out why you should and should not encrypt external hard drives. Once you encrypt the hard drive, you will create a protective layer on the sensitive data and files. One can do that by using software or through other methods. When we say encrypting an external hard drive, we will basically be adding a password on an external hard drive. Reasons Why You Should and Should Not Encrypt Hard Drives Encrypt Your Hard Drive Using a Third-Party Tool (KakaSoft).Put Password on External Hard Drive on Linux (By Enabling LVM).Encrypt Hard Drives on macOS (By Using FileVault).Using EFS to Password Protect Hard Drives (For Windows Home Edition).Encrypt External Hard Drive on Windows 10.Reasons Why You Should and Should Not Encrypt Hard Drives.