MILPITAS, Calif.--(BUSINESS WIRE)--SanDisk Corporation (NASDAQ:SNDK), a global leader in flash storage solutions, today provided preliminary revenue results for its fourth fiscal quarter ended December 28, 2014. The company estimates total revenue to be approximately $1.73 billion, lower than the previously forecasted revenue range of $1.80 billion to $1.85 billion. The lower revenue was primarily due to weaker than expected sales of retail and iNAND products. Non-GAAP gross margin for the four