deniro,
As regards the files on your hard drive which you do not want to be accessible to a thief, you might review and experiment with the information in:
How to create a password-protected (encrypted) disk image.
My usernames, passwords, account numbers, answers to security questions, and social security numbers are accessible only through a strong password for my .sparsebundle disk image.
Special Note:
Important: If you forget the password, data stored in the encrypted disk image cannot be retrieved. If you have saved the password in the keychain, the password will be available to you there.
