ASUS ZENBOOK UX21E (KX004V) - full specs, details and review
M.2 NGFF SSD to 18 Pin Extension Adapter Card for UX31 UX21 UX21E UX31A*wyBADE | eBay
BONGKAR LAPTOP ASUS ZenBook UX21E-GANTI SSD M.2 ..Tenyata beda ya - YouTube
128GB MSATA SSD SanDisk SDSA5JK-128G per Asus Zenbook UX21A UX21E UX31A UX31E EUR 23,82 - PicClick IT
M.2 NGFF (B / B+M key) interface SSD (i.e. two gap SATA protocol m.2 ngff) to 12+6 pins adapter or converter (PCi-e mSATA 18 pins), It supports 4 kinds of different sizes
Asus Ux31a Notebook SSD 256gb 512gb 1tb 2tb per ASUS Zenbook UX21 UX31 UX21A UX31A UX21E UX31E Laptop SSD sostituire SD5SE2 SDSA5JK - AliExpress