Hard drive maker Western Digital ( WDC) is another name that's turned out impressive book value growth, racking up a 32.3% hike in the firm's book value per share over the course of the last year. Western Digital is now the world's largest hard drive manufacturer, thanks to the acquisition of Hitachi's hard drive business that closed in March. >>5 Toxic Tech Stocks to Sell Now Data storage, hard drives in particular, have been in high demand over the last few years as increasingly connected devices like smart phones hike the amount of data that consumers and companies store in "the cloud." That positive trend for WDC isn't showing any signs of abating right now. While Western Digital's bread and butter has been the consumer and office market, the Hitachi acquisition exposes the firm to far more high-end enterprise drives that should help to deliver higher margins once the last integration costs of the acquisition fall of WDC's income statement. Financially, Western Digital is in good shape in spite of the debt load that the firm took on to fuel the purchase. The firm still boasts more than a billion in net cash, and a new source of cash flows that should help pad those coffers in the years ahead.