each ssd will be assigned a different drive letter.  the first one C:, next one and so on. you can manually choose which drive to save your data. if you currently have no m.2 nvme ssd installed, then the WD BLACK 2GB SN850 can be added.  but if you already have m.2 ssd, to add a second one such as WD BLACK 2GB SN850 you would need a PCIe ssd adapter and install it in PCIe slot.  this is because R12 mobo has only one m.2 ssd slot on board. R12 storage spec . Storage specifications Two 2.5-inch hard drives SATA AHCI 6 Gbps Up to 2 TBOne 3.5-inch hard drives SATA AHCI 6 Gbps Up to 2 TBOne M.2 2230/2280 solid-state drive PCIe NVMe up to 32 Gbps Up to 2 TB
  So I'm new to computers and I have a 2GB SSD. If I were to buy another would it all be one on my C drive or would I have 3 different places to download things on? I hope what I'm saying makes sense? If not I guess I will say does 2 be put into 1 on the computer itself I guess. I also wanted to ask if I were to buy one does WD BLACK 2GB SN850 fit in my Alienware Aurora R12?
Aurora R12, ISSD questions