Regarding Lenovo Legion Y520 series (Y520-15IKBN) M.2 PCIe SSD-English Community
Lenovo Legion Y520-15IKBM Specs and Details - Gadget Review
Обзор ноутбука Lenovo Legion Y520: кто хочет стать легионером? / Ноутбуки и ПК
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boot - Ubuntu 18.04 does not load SSD NVMe XPG Gammix - Lenovo Gamer Legion Y530 - Ask Ubuntu
Lenovo Legion Y520 (GTX 1050 Ti) review – the Y-series are finally on the right track
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