Now I discovered this using DISKEDIT. It's a double word at offset 488 (1E8h) of the second sector of the FAT32 boot record (which consists of three sectors, not one as for FAT12 and FAT16). But actually this is described in http://www.microsoft.com/hwdev/download/hardware/fatgen103.pdf
It's declared in hdr/xstructs.h as xdpbforformat.setdpbcounts.nfreeclst but I don't see it updated anywhere! I suppose that this should be done at the end of kernel/fattab.c:link_fat() along with the update of the dpbp->dpb_xnfreeclst, but how to do it?
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