Prompt utilities, programs that can make part of the hard disk password-protected, encrypted.
Perhaps still useful utilities that can do something useful and interesting with an external screw.

Thank.

    2 answers 2

    If you want to encrypt individual files, then GnuPGP is suitable. If you want to encrypt more significant volumes (for example, a whole disk), then TrueCrypt is suitable. Both tools are free, available in source, work under Windows, Mac, Linux.

      As an option, try this: BitLocker .