2.Supports 4/8/15 hard drive caddies

3.SATA I, SATA II Hard Drive (with Removable Caddy)

4.Duplex Operation(REC & Playback Simultaneously)

5.Compatible with Network Cameras

6.TMSP*1 Protocol Protection Gives Security Data Leak FREE

7.Optional Raid 1(Mirror)/Raid 5/Raid 6 recording

8.Built-in Management Software, such as Auto Hard Drive Partition Allocation (APA)

9.Hard Drive Failure Notification via E-mail

10.Failure-over (N+1) Protection