I posted this in the Comcast 3412/3416 thread but it's not clear that was the best place, so I'm posting it again here (please excuse the duplication):
I finally had Comcast replace my misbehaving first-generation DCT6412 which, three or four times, had spontaneously reset itself and cleared all recordings and all metadata, exactly as if I had performed a Master Reset (which I had not).
When I put in the request I told the CSR that I wanted a box with an HDMI output but I also asked them to note specifically that I wanted a box with a 160GB hard drive (not knowing whether Comcast was even deploying them yet in my area).
To my surprise, the tech showed up with a DCT3416.
So far, so good, though it's certainly too early to tell. It's only been a few hours.
The problem I'm having now is that I can't capture data from the 3416 on the XP system that I had been using for captures from the 6412. I re-downloaded the drivers from http://http://replayguide.sourceforge.net/dct6412/
and installed them as described on that page (though the installation messages differed a little from what's described there).
CapDVHS sees the device ("Digital A/V Tuner Device") but the captures aren't usable--it never detects the resolution of the data and populates the data info. The streams I tried to capture were network broadcasts, which aren't encrypted, so there should be no issue there.
Is there another set of drivers I should be using rather than the ones I downloaded from the above-mentioned page, something that's known to work better with the 3416? Or are there some additional tweaks I need to apply, or something obvious that I might have overlooked? (I think I still have the original drivers that I used with the 6412 available, though what I just downloaded is supposed to be newer.)