U.S. stock futures mixed, Dow up 100+ points. Western Digital falls after earnings beat expectations but lowers guidance. Other stocks dip in pre-market.

U.S. stock futures mixed, Dow up 100 points. SpaceX stock falls 10.3% after reporting strong Q2 revenue but a loss. Other stocks also decline.

Western Digital (WDC) will report Q4 earnings on Aug. 5. Analysts expect $3.30 EPS & $3.7B revenue, higher than last year.