Patrick,
Am I on the spot, or totally wrong?
PD> Sounds like you're at least on the right track. PD> Hope that helps, PD> -Patrick.
Thanks a lot for your answer. I think one reason why I was confused is because the bitmap of the header node, even in HFS, contains enough room for 256*8 nodes, that is 2048, which happens to be the biggest clump (global or constant in SVerify1.c, I think).
On the other hand, my code produces HFS/HFS+ CD-ROM images, and I allocate a single catalog extent, for which I should build the map linkage immediatly if needed (if the catalog is more than 2048 nodes in HFS).
Well, I know what I'll have to do.