DiskCryptor is an open-source application that allows you to encrypt the disk drives of a system. This software can encrypt the entire hard drive or its individual partitions, including the system partition. The program uses secure algorithms AES-256, Twofish, or Serpent. It allows you to encrypt existing partitions with data inside (instead of having to format them before using them), thus avoiding the need to perform annoying data backups and then restore them. DiskCryptor works quickly. Additionally, it allows you to enable the password cache option, which will store them in the reserved memory space of the kernel, further speeding up operations. You can even boot from encrypted partitions, and there is full support for LILO, GRUB, and other boot managers.