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HP EliteBook 640 14 inch G9 Notebook PC (4D0Y4AV)

I've read some other discussions about adding a 2nd hard drive to a Elitebook.  I have a 640 G9.  The maintenance and service manual (https://kaas.hpcloud.hp.com/pdf-public/pdf_5816250_en-US-1.pdf) does mention a second slot and installing a 2230 plus a drive support kit on pages 47-49.  The pictures for the 2nd drive don't match my laptop, however, and may be wrong since they show the secondary drive in the same location as the primary. 

 

I did have success adding a m.2 2242 drive without a support kit.  I added a SAMSUNG 256GB SSD M.2 2242 PM991 NVME PCIe MZALQ256HAJD-000L2 in the location that would be for the WWAN module, but my laptop didn't have antenna connections there, so perhaps that is why it worked.

 

 

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