Lenovo Legion 15.6" Y520-15IKBA NVMe M.2 128GB SSD Solid State Drive M – Got Laptop Parts - Tested, Certified
Lenovo on Twitter: "Hi! Thanks for reaching out. Good question, based on the parts listed in this article https://t.co/VsRcGVhGgI page 66 the Legion Y520 uses M.2 NVMe SSD. Kindly check this link
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How to Upgrade M.2 Nvme Pcie SSD Lenovo Y520 Legion Disassembly - YouTube