Thank you for the reply. Yes, I used sudo, I followed the directions exactly until I couldn't. I think it was mount_hfs that was "not allowed". I wasn't even sure this was a good idea, why would using the EFI partition change the order that the partitions were displayed or make com.apple.Boot.plist start working; but I was going to try it. I've found a few other posters who couldn't make Default Partition work, but only one report of "not allowed" like mine.
"What about hide and rename, do those work for you?" You mean hide the Windata partition so it wouldn't take up a space on the displayed partitions? I didn't think of it so didn't try, I can still try it and it seems worth a shot. Maybe it will work and not fall prey like the Default Partition. I have worked around it, but it's ugly and to describe it as inelegant is too charitable, it's a kludge. Grub2 and Burg is buggy. Somebody on this forum suggested the SystemConfiguration edit, so I tried it, grasping at straws. I just remembered, I think I was able to write the dd command successfully, but I don't know if it really went to EFI. Nothing changed. I'll try rename. Thanks. UPDATE: I tried "hidden" which had a zero effect. I tried on different possible partitions also; nothing is hidden.