Worth doing: Thinkpad X220 with an mSATA SSD : r/thinkpad
GreenTouch mSATA SSD 1TB M3 Internal mSATA Drive 3D Nand Flash Solid State Drive for Mini
51nb: Extra mSATA (3.0) in the X230! : r/thinkpad
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Best of both worlds round 3: mSATA SSDs « Super User Blog
Putting M.2 SSD in Thinkpad X230 (possible, but requies modification) : r/thinkpad
Lenovo Thinkpad x230 Max Memory and MSATA Upgrade! - YouTube