NeXTstep: cloning a drive

Does anyone happen to know where I can find a "whole disk" device file within NeXTstep? I was going to clone the OS drive of a mono Slab onto another (identical model) hard disk, figuring I'd just 'dd' the contents from one to the other. Problem is there's no obvious "whole disk" device under /dev, either for the OS drive or the "target" drive that I'm hanging off the back of the Slab. /usr/adm/messages gives me a couple of relevant entries: <drive name> as sd0 at sc0 target 1 lun 0 <drive name> as sd1 at sc0 target 2 lun 0 ... where <drive name> is just the vendor's ID string (Seagate ST1480N) and the drive's firmware revision. Unfortunately there's no such files as the obvious /dev/sd0 or /dev/sd1. There are /dev/sd0<a..h> and /dev/sd1<a..h> files, so maybe one of those (h?) corresponds to the whole disk? (according to 'mount', /dev/sd0a is the root OS partition) I could just pull the OS drive out of the Slab and hook both drives up to a Linux box and 'dd' there - but I thought I'd take the route of minimum dismantling, and of course I assumed it'd be an easy 5 minute job :-)

cheers Jules