Back then, normal-sized SSDs were still expensive. That baby 32gb SSD was likely setup using Intel's (rather lame) Intel-RST caching technology. Also, pretty sure that M.2 slot is only SATA-3/600 capable. Personally, I would just remove that little SSD. Now-days, there is usually little reason to use a (old tech) SATA-based-M.2-Slot in a desktop.  Clean install Windows-10 (only ONE drive connected). You could made existing spinning-platter HDD as C-Drive. I guess to that to make sure machine even works. [URL]#M3401 But actually, that HDD is it pretty slow and likely old (and getting ready to fail). Machine itself is also kinda slow. If you must use that old HDD, be sure it's SMART-status is good. Personally, I would instead drop in a famous-maker (well-reviewed) 2.5inch SATA-3/600 SSD and make it C-Drive. It will then boot and load programs 3-5 times faster.
I'm helping a friend with this computer he just received.  It is probably 5 years old.  The computer crashed and I'm not sure what happened.  It was running fine. This computer has two disk drives. 1. 32Gb m.2 2. 2Tb HDD The 32Gb is not initialized (per disk manager) so i'm not sure if Win 10 was installed on this drive.  I did find Win 10 on the HDD but not a user folder. How was this computer configured from Dell?   Is 32Gb enough to run Win 10 or is that drive used for something else?   Thanks. Darryl
XPS 8700, reinstall Windows 10