HVRM-04 Extended storage device for HVRM series 4 HDD Racks with Hot-Swap SATA Drivers Support HVRM-HD1600M & HVRM-T1600L DVR Network Storage for HVRM Series DVR Supports HUNT HVRM Series DVR products Up-to 8TB Internal storage and expanded to 32TB with cascade Built-In 4 Hot-swappable SATA HDD Bay Intelligent Power Failure Recovery 1 Gigabit Ethernet for DVR direct connection 1 Gigabit Ethernet for storage cascade Extended Storage Device for DVR