So, it comes with a 1 TB drive. I think you could upgrade with this:Solid state storage is not expensive, not in the kinds of sizes you’d be looking at to supplement the PS5 storage.
https://www.microcenter.com/product...80-pcie-nvme-30-x4-internal-solid-state-drive. Pricey now. Maybe go for 1/2 that in the next 2 years or so.
I dunno if I'd get a 1 TB expansion for a total of 2. I have a PS4 with 2 TB and filled it up pretty quick. The other has an 8 TB external which does give me some trouble (I think it is barely recognized by the PS4 Pro due to its size) but I've got about every PS+ game I've gotten in the last 7 years and then some. I've stored about 4 to 5 TB so far.