Gatali :
HOW CAN I SET PASSWORD FOR EXPANSION PORTABLE DRIVE SO THAT NOBODY CAN ACCESS MY DATA WITHOUT MY PROMISION
Your have posted in the Mac OS X forum, from this I can only assume you want to secure a Mac OS X enternal drive.
Use Filevault for this (google it). The software you selected as 'best answer' only runs on Windows
The first answer is not necessarily the best..