[U.S. storage sector stocks broadly decline pre-market, SanDisk drops over 7%] BlockBeats reports, on July 1, according to BIT (bit.com) market data, U.S. storage sector stocks saw broad pre-market declines, including: Seagate Technology (STX) down 4.87%; Western Digital (WDC) down 5.57%; SanDisk (SNDK) down 7.14%; Micron Technology (MU) down 5.29%.