Western Digital today announced that their proposed acquisition of SanDisk has passed its final regulatory approval, with the final stamp coming from China's Ministry of Commerce. As such, the deal can be officially closed May 12th, meaning the merger will be official. SanDisk is a leader in the flash storage industry, with the company being responsible for many innovations in microSD and SD cards, as well as USB flash drives. Western Digital's expertise comes from the traditional storage industry, with the company commanding a diverse lineup of hard drives and other storage products. The deal is worth $19 billion.