You need to understand the difference between a sysgen, and just copying a disk. A sysgen means doing a build of the kernel, all privileged tasks, and creating a system image from this. Copying is just copying. BRU can also copy the system image and make sure it works on the new disk. If you want to do a sysgen on the disk, the easiest way is to copy the whole disk with whatever tools you prefer, and then run the sysgen on the new disk. That will create a bootable system on the new disk. If you just want to copy over the system from the old to the new disk, BRU should be able to do that. I think BRU should do the trick in V3 as well as in V4. PRESERV was deprecated somewhere along the line since it appearantly had some inherent problems that DEC didn't want to do anything about since BRU did a better job anyway. Johnny Julian Wolfe wrote: