HDD and (PCie) SSD confusion

[danny.smith7531]

So I am thinking of purchasing:

https/www.amazon.com/Lenovo-Legion-Y520-i5-7300HQ-80WK00FHUS/dp/B06WVMJ713/ref=pd_sbs_147_1?_encoding=UTF8&pd_rd_i=B06WVMJ713&pd_rd_r=W5YKDGGHFN4CZ08K79N0&pd_rd_w=Tz8JE&pd_rd_wg=9EkzF&psc=1&refRID=W5YKDGGHFN4CZ08K79N0

This laptop. Sorry, I don't know how to condense the hyperlink to one word or anything fancy like that. It says it comes with 256 PCIe SSD as the memory.

The questions are: Can I buy a 1 TB HDD separately and install it into this machine myself? Can I have it alongside the SSD? Would I have to replace it? Is it even worth it? Am I wasting my time worrying over this? I know 1 TB is a lot, I am primarily a writer and will mostly play games like Dark Souls 1, Stellaris, Civ, Cities: Skylines, Fallout: New Vegas (modded) and other similar type of games. Nothing from this generation really. Do I need to worry about this stuff?

 

[Lutfij]

These links:
https/www3.lenovo.com/us/en/laptops/ideapad/lenovo-legion-y-series-laptops/Lenovo-Y520-15IKBN/p/88GMY500808
http/bestpcmonitor.org/lenovo-legion-y520-80wk00fhus-review-nvidia-geforce-gtx-1050-ti-256gb-ssd-i5-7300hq/
that you can drop in a 2.5" HDD into your laptop.