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This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Date: Mon, 3 Aug 1998 13:46:22 -0600
> 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.
> Thanks,
> Karishma

You can use an editor which allows you to change binary files, such as emacs,
to correct the 'number of records' in the file. This is a bigendian 4 byte
integer which begins at the 4th byte in the file.

This is what the first eight bytes would look like in emacs if you had zero
records:
CDF^A^@^@^@^@
and this is what it would like if you had 6 records (^F is ascii 6)
CDF^A^@^@^@^F

See Appendix B of the netcdf user's guide for more info.

-glenn