When attached to a PC, it operates as a Hi-speed USB 2.0 (or IEEE 1394 external hard disk drive), with a large capacity of disk storage. When attached to an AV device, the Mobile Video HDD lets you browse and playback your entire media library directly to your TV or Home Theater! .. The Mobile Video HDD can play back Mpeg1 (VCD), Mpeg2 (DVD) movie files, MP3 music files, Jpeg photo and graphic files, DivX/Xvid (AVI) and movie files. (GMC and Q-PEL pertaining to DivX and Xvid are not supported.)