I usually boot up GPARTED (see google for this freebie and tutorials) then make sure the new drive is BLANK. Delete all partitions on it since W10 and a few other OSes will give that message when there's a partition on the drive.
I have bought an adata su800 m.2 128gb ssd but it wont let me install my os to it, windows 10.
it is telling me that a partition is not found and im not sure what to do about it. i have never used an ssd, let alone an m.2 ssd. I ask if anyone would know how to help me please.