== Spelling question == 
 What is the rationale for the double "l"? None of the references cited use it; a search on Google for "define:levell" shows no results and a regular search returns references only to its use as a family name. Would it not be more appropriate for this page to redirect to "Wear leveling" rather than the other way around? Apologies if I'm being USA-centric, but I did try to figure out why this spelling was being promoted here.