Thanks,
I've also upgraded my cameras from the crummy 420TVL ones they advertize as High Res.
My minimum is now 650TVL. I could only identify people I already knew with the old ones. Now to add more drives. After reading this thread I've been able to make a better assessment as to what I'll need in drive space in order to achieve my desired retention time. My unit will allow a maximun of 6TB across 2 drives and I've already installed my 1.5TB from the old unit and placed the original 500GB back into the old unit.
As for selling the old unit - not quite ready to hand it off. A few of us old guys are about to use it in a sting operation to catch some young punks that like to spray-paint fences in the neighborhood. I don't know about the UK, but here in the States - especially in the cities - that's one of our worst property crimes, after theft. We've not yet decided whether to print off some WANTED posters before or after handing the video over to the police.
Cheers,
Norm
San Antonio, Texas