美股开盘集体下跌，纳指跌0.45%，贵金属板块集体走低

Group 1: Market Overview - U.S. stock market opened lower with the Dow Jones down 0.34%, Nasdaq down 0.45%, and S&P 500 down 0.35% [1] Group 2: Storage Sector Performance - The storage sector saw a strong increase, with SanDisk rising by 22%, and has gained over 130% since the beginning of the year; SanDisk's Q2 revenue and earnings per share for fiscal year 2026 significantly exceeded expectations [1] - Micron Technology increased by 3.3%, and Western Digital rose by 2% [1] Group 3: Precious Metals Sector Performance - The precious metals sector experienced a collective decline, with Pan American Silver dropping nearly 11%, Harmony Gold falling by 8.6%, and Newmont Mining decreasing by 6.8% [2]