What hard drives are compatible with the ProBook?
Supports a variety of hard drives including models such as 1-TB, 750-GB, and 320-GB capacities at various RPM speeds. Also supports SSD options like 512 GB, 256 GB; SED and non-SED configurations available too (Page 49).
From the official HP Probook 640 G1 Notebook PC manual, page 49
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