Let first explain my problem.
I installed NAV2000 and make 5 dikettes 1. Emergency Boot 2. Program Disk and 3. Three defininition dikettes. Than I uninstall the NAV 2000 and copy all the diskttes (Making 5 sub directories as per its names) on one of my HDD partition (20GB HDD 6 Partitoons). whenevrer I need I run the navdx with appropriate command line. Know my problem is how to upgrade these difinition directories or diskettes.