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HP EliteDesk 800 65W G4 Desktop Mini PC

can I add a 2nd pcie ssd card to my HP EliteDesk 800 G4 DM 65W

I have a HP EliteDesk 800 G4 DM 65W running Windows 10

It's Expansion slots are listed as:
1 M.2 2230; 2 M.2 2230/2280

and with a WDC PC SN520 SDAPNUW-256G-1006 for storage.

I want to install a new 2nd SSD if possible 

I am planning to install linux on the 2nd SSD and then run Windows under Oracle Virtual Box and access the old 1st SSD file system.

Is this feasible approach to the storage?
If it is, what is the largest storage device I can add?  Is it a 1TB , such as 1 TB, M.2 2280, PCIe NVMe TLC SSD
such as https://www.amazon.com/Silicon-Power-NVMe-Gen3x4-SP001TBP34A60M28/dp/B07ZGJVTZK?th=1

Or might it now accept a 2TB such as [Crucial T500 2TB PCIe Gen4 NVMe M\.2 SSD with heatsink](https://www.crucial.com/ssd/t500/ct2000t500ssd5)

I have not yet opened the computers chassis to see what is free and not sure I know how to inspect it so appreciate any guidance.

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