The ARRIS DCX3520e-M includes the latest audio and video output, with support for full 1080p60 high-definition output, HDMI™, award-winning Dolby® Digital Plus, and Dolby Volume intelligent multi-channel audio leveling. In addition, the DCX3520e-M features an internal 500 GB hard drive, which can be expanded to 1 TB or more using an external disk drive connected to the set-top’s eSATA interface.