Western Digital Corporation provided earnings guidance for the quarter ending March 2013. The company expects revenue in the range of $3.55 billion to $3.65 billion reflecting the current demand environment, the seasonal change in business mix and the conclusion of 3.5-inch contract manufacturing arrangement with Toshiba; Gross margin of approximately 28% excluding the amortization of HGST intangibles. The company expects R&D and SG&A spending to be approximately $540 million, excluding the amortization of HGST intangibles, a tax rate of approximately 7%.