Being able to reuse an old SATA M.2 or a brand-new NVMe drive in the same enclosure is a massive selling point. Conclusion
: Ensure your M.2 SSD is either M-Key (NVMe) or B+M Key (NVMe or SATA). The bridge does not typically support older mSATA or M.2 PCIe AHCI drives. rtl9210b datasheet
She smiled. RTL9210B—an obscure controller that had powered countless unloved peripherals. To most people it was just a part number, but to Mina it might be a map. Being able to reuse an old SATA M
While a formal "one-piece" public datasheet is often restricted by Realtek to signed NDAs, technical guides and enthusiast-archived files typically outline its core capabilities: Key Technical Specifications rtl9210b datasheet