My 32GB HD+ booted from a Sandisk 16GB Class 4 card with no problem and CM10.1 installed and updated easily. When I cloned this card and tried to boot my wife's 16GB HD+ with it it failed. Using CWM 7.1 on an 8GB Sandisk Class4 it booted with no problem and I was able to install CM10.1 with no difficulty. From what I could glean from XDA Forum postings persistence is the key and it may take several attempts and different cards.
BTW, our local B&N store considers rooting on an SD card as a violation of the warranty and will not exchange a Nook because it will not boot from the SD slot.
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