Putting M.2 SSD in Thinkpad X230 (possible, but requies modification) : r/thinkpad
IT x Diary: How to install mSATA disk to lenovo x230
Original For X250 X240 X230 Ngff Ssd Small Solid State Adapter Board With Cable Ns-a056 Works Well Free Shipping - Laptop Repair Components - AliExpress
NEW 1TB mSATA SSD SATA III 6Gb/s For ThinkPad X220 X230 T420 T430 T430S X1 W520 | eBay
X230 MSata SSD Upgrade - YouTube
ThinkPad x230にmSATAのSSDを増設した話 | 迷惑堂本舗
Using Intel AX200 M.2 WLAN card with mini-PCIe <-> M.2 adapter on Lenovo ThinkPad X230 - it works - Thinkpads Forum