Akido,
I am not really taking it personal. Not at all. But just hanging around these forums (a little too much I might add)..all these so-called bugs are non-existant or can't be re-produced. Most of the time its users error...hell 99% of the time its user error

I don't believe this one is the case. But in order to get to the bottom of a problem, you have to exhaust all possibilities. For you to say its 99% a bug when it could be 99% your hard drive is silly. You really don't know. If you swapped out the hard drive with another and produced the same results...that would be a better indication that it is the MPC..or your MPC. If you have noticed, there are only a few people that have responded to this thread vs the numerous people that own a 2500 in this forum. As of right now, the problem is isolated. You logic has concluded that it is the OS...and that you have always had this problem?? SO this was a problem with all the OS? Then you talk about the hard drive waking up. It shouldn't take anytime for your drive to wake up (maybe it is your drive). Did you try waiting a bit to allow your drive to wake up?
Also note..I have nothing to gain (except a fully functional MPC) by getting to the bottom of any problem. I had a problem with my screen going blank after installing the operating system. No one in the forums produced this problem. I had to send it to Akai to have them fix it.
Anyway...you are free to continue to write what you want. If you don't want to exhaust all possibilities..that is your choice. Just chalk it up as a bug with the OS. What ever floats your boat

One more thing....did you try re-formatting your hard drive after installing the new OS?