Password Protect External Hard Drive How Would I Password Protect My External Hard Drive?

How would I password protect my external hard drive? - password protect external hard drive

I have a One Touch 4 Mini Portable Hard Drive.
I either a password to protect the whole or, better yet, a password protected, only a part.
I do not need encryption, have only one password.

Wouold How can I do?
Is it possible without a 3rd party program?