The reason I asked is that there were conflicting numbers. Some said it was limited to 4.
That's news to me - I get each new post emailed to me immediately and missed that one. For the last two weeks the discussion has ALWAYS been unlimited drives one (real or virtual) at a time.
The limit number of 3 was given for how many times you can MOVE a show to and from two different 622 receivers.
Search is not as helpful as it could be. Just treat the responses like CSRs. If you get one that doesn't help, go to the next one.