Thanks for the thread, it is very informative, I did have a question, however. If it has already been asked on this thread, I am sorry. I tried the search but it didn't seem to turn up any results.
Simple question, just how big a hard drive can you use in say an HR22-100? I noticed that there are now 4TB drives in existence. I don't really have need for that much storage, but I'd hate to find a good deal on a large drive some day only to find out that the DVR doesn't support the full capacity of the drive.
So far only Hitachi announced one model 5K4000 in December, but no one store selling those.