A former ByteDance employee recounts how he spotted persistent price increases for Seagate hard drives on Pinduoduo, traced the cause to AI data center demand for nearline enterprise HDDs, analyzed Seagate’s financials and HAMR technology, and used 13F institutional filings to confirm a multi-quarter trend of growing institutional ownership. His initial 500-share purchase at ~$150 grew to ~$965 per share, achieving a 6x return. The article details the step-by-step investment logic: observing real-world price anomalies, linking them to structural demand shifts, identifying the public company at the key node, and validating with institutional data. It also warns about survivorship bias and short-term noise.