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Hi Klaus, We saw a similar error in August 2004 on an AIX system, but it turned out to have nothing to do with netCDF. The problem then occurred when trying to write a file a litle larger than 2 Gbytes on a file system not configured for large file offsets. You could test if this is the problem you're seeing by invoking the following Unix commands in a writable directory on the same file system on which you are trying to write a netCDF file: dd if=/dev/zero bs=1000000 count=3000 of=foo ls -l foo rm foo which should write a 3 GByte file named "foo" in the current directory, verify its size, and remove it. If that's not the problem, please let us know. --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