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Sorry, this isn't specifically a Fortran question, but I know if I ask it here I'm much more likely to get helpful responses :-) I have an extremely expensive calculation whose results I can write to disk and use repeatedly as long as the 'data' the results are calculated from doesn't change. Knowing whether the 'data' matches the cached results on disk is the problem. I had thought one could compute something like the md5 checksum of the data (these would be Fortran arrays, not a disk file) and include it with the cached results. Then all I need to do the compare md5 checksums. Is this a reasonable plan? Is there something better? What about a free fortran implementation of md5 checksums? Thanks! -- Neil Carlson <[log in to unmask]>