I can't even see or get at the OEM drive's jumper settings without seriously disassembling several components inside the case; it's nuts man. So making the secondary drive's jumper settings jive with the cable select thing (IF that's in fact Dell's OEM setting for this machine), would be a lot easier than changing the jumper on the OEM drive.
Frankly though, since the system can see and query the drive, I don't think I'm being unreasonable in questioning why I cannot format and assign a letter to the damn thing right from XP. Makes zero sense.
...into the light of a dark black night.