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256GB SATA 6GB/s 2.5" Internal SSD Compatible with HP/Compaq EliteBook 755 G3, 820 G2, 840 G2 By CMS C91 - Walmart.com
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Refurbished: HP EliteBook 840 G2 14" 1600x900 HD+ Ultrabook PC, Intel Core i5-5300U 2.30GHz, 8GB DDR3L RAM, 256GB SSD, Win-10 Pro x64 Grade A - Newegg.com
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How to Install M.2 SSD & Hard drive Combo in HP EliteBook 840 G1/How to install M.2 ssd and hdd - YouTube
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