My point is: there is no need for non-expanded blocks to be held on disk.
BTW, I have the impression I'm not understanding what you are aiming at. Instead of discussing the solution, can you point out the problems you see first? I think that would help me understand because at the moment, I'm not sure I do.
I'm not aiming at anything, just trying to understand/discuss... May be I just should wait for your introduction at gettogether :)
Vadim
