converting GTOPO30 or SRTM30 to ESRI grid format

Discussion created by EMSMM on Feb 6, 2011
I'm having trouble converting SRTM30 to ESRI grid. I'm in ArcMap10 and using the instructions http://www.geo.utexas.edu/courses/371c/Labs/Software_Tips/GTOPO30_import.htm
For the tile w180n90 the "export", "raster to different format" using Arc Catalog fails. For another tile which had previously been exported I'm unable to get the raster calculator to perform the instruction
CON([in_grid] >= 32768,[in_grid] - 65536,[in_grid]) successfully.
This may have been talked about previously. Any pointers appreciated.