Thanks, Shep.
The "extra' USB drive was read by the install disc as "sd1"; but there are no sd1x identifiers - only xxx0x identifiers on the install disc.
I know - occicat might not like my approach; and may pounce on this thread; but I'm reading FAQ-14, fdisk, mount, and disklabel right now. From the hip, reading and multitasking (non PC chores), I can see that mounting the device by name or using disklabel may be a factor.
I'm using a Linux LiveCD in the meanwhile; and have contemplated using a similar function so I can get this over to
bugs@openbsd.org
Again, thanks.