We are interested in measuring both physical and logical I/O on specific files. FILERPT v. 2.94 (Allegro) seems to operate on all files and then highlight the big-time spenders. It also requires that we trap FCLOSE records in our log files. We do not do this as we found that we quickly ran out of disc space on log files! Is there any method to get the data we want? Tools we have and may not be using to the fullest are Glance and SOS3000. Thanks, Leonard Berkowitz, RIA Group (Warren, Gorham & Lamont) 617-292-8349 (E. D. T.)