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- Date: Thu, 30 Jul 1998 09:02:25 -0600
Hi Karishma,
> I have some netcdf files which have data in them and were apparently not
> properly closed. When I examine them using ncdump they report zero data
> points, although the size is a few meg.
> Is there a way of recovering them ? I have looked up the netcdf web page
> but couldn't find anything obvious.
From the NetCDF User's Guide for C, section 4.1 (Creating a NetCDF
Dataset):
Finally, you should explicitly close all netCDF datasets that have
been opened for writing by calling nc_close. By default, access to
the file system is buffered by the netCDF library. If a program
terminates abnormally with netCDF datasets open for writing, your
most recent modifications may be lost. This default buffering of
data is disabled by setting the NC_SHARE flag when opening the
dataset. But even if this flag is set, changes to attribute values
or changes made in define mode are not written out until nc_sync or
nc_close is called.
and the NetCDF User's Guide for FORTRAN contains a similar passage.
So unfortunately your unwritten data was left in the memory buffers that
were never flushed by a close, and there is no way to recover them.
Sorry about that ...
--Russ
_____________________________________________________________________
Russ Rew UCAR Unidata Program
address@hidden http://www.unidata.ucar.edu
