What hard drive sizes and types are supported by the HP ProBook 640 G1?
The computer supports 6.35-cm (2.5-inch) hard drives in 7.0-mm and 9.5-mm thicknesses using Serial ATA. Supported capacities include 1 TB at 5400 rpm, 750 GB at 7200 rpm, 500 GB at 7200 or 5400 rpm, and 320 GB at 7200 rpm, as well as self-encrypting and FIPS drive options. (Page 13)
From the official HP Probook 640 G1 Notebook PC manual, page 13
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