looking to upgrade my 5577 from 256 ssd to something bigger saw someplace that it might have a m.2 slot if so i would like...

so i'm a moron and just found out just how easy it is to open it up and look under the hood.... and it has a m.2 ssd in it already so now i just need to get a laptop hard drive. thank you for your help i assume that 2.5 drives are somewhat standardized and that most or all will fit. was thinking a wd blue 1tb :)