EMC has sued Pure Storage for allegedly colluding with some of the storage giant's former employees to misappropriate and bring to the startup confidential EMC information and trade secrets, including lists and notes on current and potential customers. Pure Storage CEO Scott Dietzen on Tuesday described the suit by EMC as a sideshow to the real competition between Pure Storage and EMC: delivering next-generation all-flash storage that is "rapidly replacing incumbent mechanical disk systems of which EMC is the market leader."