Aayush Gupta Youngjae Kim Bhuvan Urgaonkar DFTL: a flash translation layer employing demand-based selective caching of page-level address mappings. 229-240 2009 ASPLOS http://doi.acm.org/10.1145/1508244.1508271 conf/asplos/2009 db/conf/asplos/asplos2009.html#GuptaKU09