So the card arrived a few days ago.
The first time I inserted it, the Nook HD+ said it needed to be formatted.
I think they come from sandisk as exFat.
I formatted it in the Nook which made it Fat32.
Formatted the card shows 119Gb free.
After unmounting it and using a speedy usb3 sdcard reader to
copy gigs upon gigs of media, I inserted into the Nook and it
froze, then soft rebooted.
It works just fine otherwise. I can copy files from the internal memory
to the 128gb card no problem, but if I power down then turn on or unmount it, eject, then insert
the card any time, it will freeze and soft boot. The 64gb sandisk card never did that.
Running verygreen's CM 10.1 build from last August which I like
as I don't really have any issues other wise.
I usually leave the Nook on all the time and let it sleep so
it's not really a big deal, just thought I would share my experience.