Please note: Not all of the DVR will come with the hdd, please choose th. E item that you need before you place an order. Option: 4 channel;No HDD. 4 channel 1080N DVR. Option: 4 channel; 500GB HDD. 4 channel 1080N DVR with 500GB hard drive. Option: 4 channel; 1TB HDD. 4 channel 1080N DVR with 1tb hard drive. Option: 8 channel; No HDD. 8 channel 1080N DVR. Option: 8 channel;500GB HDD. 8 channel 1080N DVR with 500GB hard drive. Option: 8 channel;1TB HDD. 8 channel 1080N DVR with 1tb hard drive. Option: 8 channel;2TB HDD. 8 channel 1080N DVR with 2tb hard drive. Option: 8 channel;3TB HDD. 8 channel 1080N DVR with 3tb hard drive. Option: 16 channel; No HDD. 16 channel 1080N DVR. Option: 16 channel;2TB HDD. 16 channel 1080N DVR with 2tb hard drive.