Hi we are running NBU 50.MP6 with a large storagetek robotic library. We keep a physical log of all sdlt tapes that are inventoried - IN and Deferred ejected -Out, for good record keeping. Problem: when viewing the MEDIA LIST of tapes present in the library sequetialy by slot number, NBU is reporting some numbers missing. For instance, their should be tapes in slot 1 - 37 but in the media list slot 22, 24, 25, & 36 is missing. I can physically see the tapes in the slots though. I run a "show contents" , "compare contents" and "update volume confiuration" from within the inventory robot options and no descrepencies are reported and yet those slots mentioned above are just missing / skipped over. I have already rebooted once. Should I shut down, empty the library, start up and re-inventory all the tapes? Any suggestions? Thanks again......J