All of our drives have been purchased from NetApp, and all of the other drives in our system report revisions of either 9107 or 9103 except this drive. So, unless this is being incorrectly reported by sysconfig, the code revision must not be too significant.
It's significant; it's just that Netapp either tested and approved 0023, or somehow it "slipped through the system" by accident. (I suspect the former.)
Bruce