It supports state-of-the-art encryption algorithms, such as AES-256, Serpent and Twofish, and uses the XTS (XEX-based tweaked-codebook mode with ciphertext stealing) disk encryption mode.

The application allows you to easily create a virtual encrypted disk within a file, which will be mounted as a real disk drive, encrypt any local or portable devices, including HDD (Hard Disk Drive), SSD (Solid State Drive) or USB flash drives. TrueCrypt is an open source and cross platform software project designed from the ground up to be used as a universal solution for encrypting hard disk drives (HDD) or solid state drives (SSD) on-the-fly (the encryption and decryption process is done automatically by the software, without any user intervention). You should migrate any data encrypted by TrueCrypt to encrypted disks or virtual disk images supported on your platform.” - the TrueCrypt team. Such integrated support is also available on other platforms.

Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images. “ The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. WARNING: It is no longer secure to use TrueCrypt as it may contain security vulnerabilities!

Truecrypt 7.2 reeview