Please see the original post/answer here  "Yes.  I have a 5577 and have a 512GB M.2 SSD and I installed a "full size" SSD in the spot for a hard drive or SSD.  I have a Samsung EVO 850 installed in mine.   I use my 5577 for my audio recording studio, not gaming.  I have it set up for Dual Boot.  The full Dell disc image on the M.2 SSD and Win 10 and my recording studio software on the added SSD.  If I want to do regular PC operations (or Gaming) then I boot to the Dell image.  If I want to do recording studio work I boot to the added SSD. I have separate installations as I couldn't get the Dell disc image completely "clean" for recording.  The separate install is Win 10, minimal drivers and only recording studio software, no other added apps." -Edited by Dell-Admin for purpose of giving credit to fireberd
Can I install dual ssd setup on Inspiron 5577 gaming laptop
Dell Inspiron 5577