Klaus, After I sent the previous response, I noticed we also had another occurrence of that same assertion violation when someone tried to write a file that exceeded their storage quota on a filesystem that implemented storage quotas. So that's another possibility. We have also seen this same symptom when running out of disk space on file systems that don't implement storage quotas, but you said you had plenty of disk space, so that's probably not it. --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: DKO-629995 Department: Support netCDF Priority: Normal Status: Closed