Lenovo Legion 15.6" Y520-15IKBA NVMe M.2 128GB SSD Solid State Drive M – Tested Laptop Parts - Replacement Parts for Repairs
Laptop M.2 NGFF SSD Compatibility List - Laptopmain.com
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Upgrade M2 SSD Lenovo Legion Y520 - YouTube
Lenovo Legion Y520 · i7-7700HQ · NVIDIA GeForce GTX 1060 · 15.6”, Full HD (1920 x 1080), IPS · 1TB SSD · 16GB DDR4 · Windows 10 Home | LaptopMedia USA
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Lenovo a 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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Legion Y530: RAM upgrade and maximum supported memory - LenardGunda.com