TCG Opal (840EVO, 850 PRO, 850 EVO) is an authentication method that employs the protocol specified by the TCG (Trusted Computing Group). You need to install TCG software supplied by a TCG OPAL software development company. User authentication is done by Preboot Authentication provided by the software. For more detailed information and instructions, please contact a TCG software company. In addition, TCG/opal can only be enabled/disabled by using special security software.