How to replace a PCIe card Predator G9-793 when 2 are present?

Larkster

I have a Predator G9-793 that has 2 slots for PCIe ssd cards and both have a card in them. I noticed that it only shows up on my pc as 1 drive of 237gb (its a total of 256 with recovery+hidden storage). I looked at the Disk Management and it does not show they are using software RAID. So, I suspect they are using hardware RAID. I may be wrong so correct me. I want to replace one with a 1tb ssd PCIe and keep the other one in use too. Is this possible and how would I go about replacing it?

(tldr: How do I replace 1 of the 2 cards with a new card( keeping 1 for extra storage with the new card) if the 2 original cards are using hardware RAID?)


This is a picture(above) of my exact layout without the cards from another post. Just imagine there are 2 cards there
the first card(above)
the second card(below)

xapim

@Larkster that's correct those are 2 128gb sata ssds in raid 0 same stock drive as I had on mine and that came in almost all 2017/18 variants with 128gb only  so if you ever need to upgrade you will have to create a recovery USB drive  (use acer care center if your recovery partition its not corrupted if not use Windows media creation tool) to install Windows clean because if you remove one of those windows won't boot anymore raid 0 spreads the data in bits between both drives and you can't make raid if you upgrade to 1tb raid will only work with 2 drives same size you would need 2 1tb drives for raid 0 o would just backup everything get the 1tb ssd format one of the 128gb install the os on it and use the 1tb as storage and forget the raid that's my best advice here