I wanted to share something for anyone else interested. I got my multi-room DVR from Insight Communications installed today. I was worried about the 500GB capacity that was on the NAS.
I was told that it was not upgradeable. Well I found that to not be true. For most, 350 hours of standard def recording was enough but not for my wife and kid. We definitely needed more.
I was able to simply install a new 2TB SATA hard drive in the NAS. It automatically formatted the drive and partitioned it accordingly. I now have 4 times the initial capacity; close to 2TB.
This WILL void the warranty I'm sure. But I was willing to take that chance.
Hope this helps someone else. I searched all over and found nothing about this. So I tried it myself.