Confused - Elitebook 840 G1 and the SSD m.2 slot 42mm - SAT... - HP Support Community - 5085271
Upgrading SSD in HP 840 G1 EliteBook, 840 G2 or 840 G3 Laptop, Solid State Hard Drive - YouTube
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HP Elitebook 840 G1 Hard Drive Replacement - iFixit Repair Guide