Well, I spoke to Edirol tech support about the HD Slow issue. They suggested trying things out at 24/48 when doing my next four channel recording, to see whether the issue arises again. This is somewhat lame to me, as I bought this deck for the specific ability to be able to record four channels at 24/96. According to the tech, who has been extremely helpful overall since I got the machine, there is no "know" problem with the R-4 Pro hard drives. This is not what I really wanted to hear. I may or may not get to run four channel tonight, and will report back.