Dear Christine, some time ago I had a problem which sounds similar to your one. In my case it turned out that the real32 can handle only a limited number of files, so I just measured to much without data management. So you could try to reorganize your database which probably will not be possible anymore within the isodat software itself. So, if you have also Windows NT on your computer system, you could try to reorganize all files in the subdirectories /gcdata and /isobase and replace them by empty ones. Then your system should work again unless there are not yet corrupt file fragments somewhere on your hard disc. Hope this helps. Kind regards Bruno ******************************************** Dr. Bruno Glaser Institute of Soil Science and Soil Geography University of Bayreuth D-95440 Bayreuth Germany Phone: ++49-921-552254 Fax: ++49-921-552246 Email: [log in to unmask] Web: http://www.geo.uni-bayreuth.de/bodenkunde ********************************************