I have a green and it does work.
My configuration was based on the following member's specific experiences:
I already had good experiences with WD green drives, so that wasn't an issue. But when I got to Fry's, I saw all sorts of other enclosures. However, I was not in the mood for trial-and-error (even though I figured that the enclosure shouldn't matter), so I stuck with the exact recommendations and got the MX-1.
The end result was a quick and first-time successful installation.
I traded the 2TB WD black for 2TB WD green and, so far, it's working for me. Fingers crossed that it stays that way. I previously used a 750 GB Seagate Freeagent Pro (not on the list) for a bit more than two years before it failed on this HR20-700. I'm using a 1TB version on another HR20-700 with no issues and, finally, an Accomdata (sp?) 1 TB eSATA external on another. Both have been in use for about a year at this point; again with no problems. It seems pretty hit or miss. (For instance, I started with the same brand/model of 750GB drives on all three and I replaced one, three different times in the first year or so, while the other two, on different units, lasted and lasted with zero problems.)
With this replacement, I've replaced all my external hard drives (three units have them) at least once now, at one point or another, which is a PITA, but better than the old TiVo way of taking the unit apart to replace the internal drive (which had to be specifically formatted) or, in some cases, the entire unit. Yikes!
I LOVE the 2TB of storage. I've downloaded 2 full seasons worth of Dexter and a full season of Weeds IN HD, plus some other HD recordings, and it's only taking up 2 percent of my hard drive. As someone notorious for leaving things on the DVR for a year before I get around to watching it, with things often just going away before I get to them, all that storage is nice.
Now, if only we could get rid of that pesky 50-season-pass limit ...
My son is growing up in a world where he has no idea what channel, or when, anything is on. What he wants to watch is just always available, any time. This is a problem when we're in, say, a hotel. I dare you to try and explain the DVR concept to a 2-1/2 year old who just wants to watch his daily dose of Curious George the instant he wakes up, like he does every other morning.