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Charlie- Yes, the default is that nc_open(path,cmode,ncidp) is the same as nc__open(path,cmode,NULL,ncidp) or equivalently size_t bfr_sz_hnt=NC_SIZEHINT_DEFAULT; nc__open(path,cmode,&bfr_sz_hnt,ncidp) I have added a note about this into the documentation of nc_open() (and nc_create()). =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: KJK-861023 Department: Support netCDF Priority: Normal Status: Closed