DiskCryptor is an open source tool for encrypting disk partitions.

DiskCryptor is an excellent tool to protect your privacy and security of your data, as it even encrypts bootable system partition.

Another important feature of DiskCryptor is that encrypted partition format is TrueCrypt compatible, which means that you will be able to open your encrypted partitions with the TrueCrypt.

All this will enable you to open an encrypted partition from a recovery Live CD, which is very useful in case of a system malfunction.