Valero Energy Corporation VLO, is an independent oil refiner. The company has a Zacks Value and Momentum score of ‘A’. It’s experiencing rising earnings estimates and major stock price appreciation. Among independent refiners, Valero has the most diversified refinery base and a significant dividend yield. Western Digital WDC, is one of the largest hard disk drive (HDD) producers in the U.S. This Zacks Rank #1, Strong Buy, is experiencing healthy demand in its end-markets for high capacity enterprise hard drives and flash-based products. The company’s strong cash balance of $6.27 billion and positive operating cash flow of $1.18 billion at the end of second-quarter of fiscal 2018 have enabled it to grow through acquisitions. These strategic takeovers are expected to provide the company with a competitive edge. The Hottest Tech Mega-Trend of AllLast year, it generated $8 billion in global revenues. By 2020, it's predicted to blast through the roof to $47 billion. Famed investor Mark Cuban says it will produce "the world's first trillionaires," but that should still leave plenty of money for regular investors who make the right trades early.See Zacks' 3 Best Stocks to Play This Trend >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Western Digital Corporation (WDC): Free Stock Analysis Report Valero Energy Corporation (VLO): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research