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i am thinking of keeping my files and data secure and have tested several programs but i'm still not really sure what kind of program should i use to keep some of my data secure. Some of them like in which i store my data on a portable hdd, and i want a password to pop up when people plug in the usb hdd to their computer? 
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i am thinking of keeping my files and data secure and have tested several programs but i'm still not really sure what kind of program should i use to keep some of my data secure. Some of them like in which i store my data on a portable hdd, and i want a password to pop up when people plug in the usb hdd to their computer? 

good and easy program to keeping files secure? windows xp, windows mobile?

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Encryption

File sharing is the practice of distributing or providing access to digital media, such as computer programs, multimedia (audio, images and video), documents or electronic books. Common methods of storage, transmission and dispersion include manual sharing utilizing removable media, centralized servers on computer networks, World Wide Web-based hyperlinked documents, distributed peer-to-peer networking (P2P) and cloud-based file syncing.