I had an old M.2 that was full, but had lots of programs and files that I still want. I also have 3 additional SSD that were all formated but only 1 showed up when I put the m.2 in. I never did anything because I was so happy the M.2 was installed and had more storage. Well here we are a couple years later and my M.2 was full. I got a new Samsung 990 ro replace my 860 M.2 but still want old programs and filtes to mo0ve to my new 990 M.2. I did a fresh install of Windows 10 on my new M.2 and installed the old M.2 in the second M.2 slot. I got the PC to boot from the new M.2 drive but bios does not recognize the old one in slot #2 and 2 of my other SSD I have in my case are not recognized either. I read something about sata ports blocking the M.2 but I am not an expert. I would like to be able to see my old M.2 and transfer some old programs and files then format it for storage. I would also like to see the other drives I have connected through the 6 sata ports, Right now in slot 1 i have the front board of my tower that has usb and audio/video jacks. sata ports 2, 3 and 4 have my 3 hard drives but only #4 is recognized in bios and disk manager. Finally in sata ports 5,6 I have 2 dvd drives connected that are recognized by everything. How do I get my old m.2 to be recognized and my other 2 SSD ? Thank you in advance and I'm sorry for the long post but I'm nit the best with these things.