I posted this on another ProForum SNAP thread, but copied it here since there is a larger pool of participants in this thread.
I, too, would like to upgrade my 4100 to something larger than 4x120GB. However, I think it is unlikely unless someone can make a friend at Quantum / Snap Appliance / Adaptec to
1. learn what is causing the limit, and
2. get a workaround.
Since the Milpitas division is just around the corner from me, I am more than willing to pony up some greenbacks to liquor up an engineer or take him/her to the Kit Kat Club for entertainment.