(Reuters) - SanDisk Corp SNDK.O said on Monday it will buy Fusion-io Inc FIO.N for about $1.1 billion to bolster its fast-growing business of providing flash storage drives to companies. Sandisk's new solid state drive is displayed at the Sandisk booth during the 2014 Computex exhibition at the TWTC Nangang exhibition hall in Taipei June 3, 2014. REUTERS/Pichi Chuang Fusion-io has struggled with l