<Certainly possible, the controller can "split" the drive into multiple <parts probably to get around this. Does anyone know what the largest drive <VMS 5.4 could use? Is that in the Software SPD somewhere? (This I have but <it is pretty opaque) <--Chuck It's not so much a limit on 5.4 as the specific hardware limits that were usually lower than VMS maxima. FOr example 3100s(early) cant have a boot device more than 1.07gb but data devices can be much larger. The problem was a artifact of early SCSI implmentations and not VMS limits. Since VMS allowed (even before V5) things like bound and shadow volumes to create terabyte sized disk fields I can see a limit for practical systems. Allison