x230 secondary SSD drive mSATA vs m.2 SATA vs m.2 PCIE : r/thinkpad
Amazon.com: CMS 128GB mSATA 6GB/s Internal SSD Compatible with Lenovo ThinkPad T420 Series - C29 : Electronics
Dogfish Msata SSD 256GB Internal Solid State Drive Mini Sata SSD Disk High Performance Hard Drive Desktop Laptop (MSATA 256GB) : Amazon.ca: Electronics
Tuning the Lenovo T520 - Upgrading Memory and Installing an mSATA SSD • Helge Klein