Seagate ( $STX) and Western Digital ($WDC): Weighing the Options in Data Storage for AI Is $STX or $WDC a Better BUY? Both STX and WDC operate in the data storage sector, with exposure to AI-driven demand for high-capacity hard disk drives (HDDs) and related solutions. Recent market activity shows elevated volatility for both stocks amid broader sector pressures on AI-related names, with STX and WDC experiencing price declines in the most recent sessions.