A stock that just doubled in a month is life-changing for existing investors, attractive for onlookers, and scary for those looking to get in at current prices. Sandisk (SNDK) is one such stock, up almost 100% in just a month and up roughly 1,000% in six months. The company is known for its various memory devices, and the reason for SNDK stock's surge is the ongoing demand for and shortage of memory products in the market. There are multiple ways to look at the question of buying SNDK stock now. But one ...