I've been converting HDF5 files to geotiff for some time, but one of them causes an error when I do h5d_open. The only difference is this new file is much larger than previous files, about twice as large (8.9 GB) and has dimensions of 8281 wide x 14208 long x 13 dates. I'm thinking the length is too large, but I can't find any documentation describing limits. My system: IDL 8.0, Mac OS 10.8.5, ~60 GB of free disk space. Thanks for any tips on how to deal with this, Tom Farr