[catching up a bit] Ideally, yes, but I've found that's not always required in practice (in admittedly limited experience). I've successfully dd'ed a couple of old SCSI drives to larger SCSI drives and was able to boot & run without issue (other than the wasted space). I suspect it works because SCSI hides many low-level details. I certainly didn't test all the boundary cases, so there certainly might be gotchas if you used the duped disk extensively or in production. On my VME532 machine, I dd'ed the ~150MB Maxtor ESDI drive to a ~300MB Maxtor and it boots fine from the larger, half-wasted drive. I wouldn't count on it working with another vendors drive, or for all permutations of ESDI controllers. YMMV. Ken