1.8-Channel Standalone DVR 2.H.264 Algorthm,Pentaplex,Support Internal CD/DVD- ... Ch Video,4 Audio 8-Channel Standalone DVR AST-DVR0804LN H.264 Algorthm , Pentaplex, Support Internal CD / DVD-RW ... Disk4 SATA ports, 4 HDDs supportedSpace OccupationAudio: 14.4MB/H Video: 56500MB/HHDD ManagementHard disk hibernation technology, HDD faulty ... HDD/ USB CD/DVD-RW/ built-in SATA Burner/ Network downloadNetwork