Western Digital shares are trading sharply higher amid a generally lower tech sector on Wednesday on news that Samsung has reduced production at its NAND memory chip plants in Xi’an, China, because of new restrictions in the region relating to a spike in Covid-19 cases. According to CNN, the city of 13 million people is under strict lockdown aside from essential services. Samsung (ticker: 005930.Korea) controls about one-third of the global NAND market, while Western Digital (WDC) and its Japan-based joint venture partner Kioxia together hold a comparable share . SK Hynix and Micron Technology (MU) are the other primary...