[U.S. storage sector stocks broadly decline pre-market, Western Digital drops over 6%] BlockBeats reports, on July 7, according to BIT (bit.com) market data, U.S. storage sector stocks saw broad pre-market declines, including: Seagate Technology (STX) down 4.96%; Western Digital (WDC) down 6.14%; SanDisk (SNDK) down 5.43%; Micron Technology (MU) down 5.46%.