A maximum of two HDDs can be installed within the unit.
will the connector take a 1mm digital coax?
This is not something it is designed to do i'm afraid.
What is the difference between this and the V2 model?
The V2 version of this camera has better flylead to facilitate transmission over cat5 as well as it's native RG59 coax.
Is this product compatible with deep base rings?
This is compatible with RING-IP-G
How do you connect an IP camera to this DVR?
Firstly you will need to login to the unit , go to System -> Digital -> Channel type, then select the configuaration that supporst IP. An IP camera is then connected to this unit via it's RJ45 (lan port) using a network switch or POE switch.