$Seagate Technology PLC(STX)$ explodes 18% pre-market. Is the "Structural New Era" of AI storage here? One-sentence summary: Q3 earnings demolished expectations + Q4 guidance dazzled the market + CEO announced 2027 capacity is fully sold out. Seagate is transforming from a "cyclical stock" into an "AI infrastructure must-have." This isn't just a solo rally for STX—the combined market cap of the four storage giants surged by $60 billion after-hours. Company After-Hours/Pre-Market Gain $Seagate Technology PLC(STX)$ +18% $Western Digital(WDC)$ +10%+ $SanDisk Corp.(SNDK)$ +4-5% $Micron Techn