Be easier if you make audio cd's. Or MP3 cd's if the stereo had a CD that supports MP3. Or move the stereo
I don't think what you're trying to do is going to work
Do you have the M.2 drivers?? If it's like a desktop, you have to configure the settings in the BIOS first
And what version of windows ? Are you trying to install windows on it, or you trying to use it as a 2nd hdd?
I think that's a diagnostic thing. It's telling you, something is wrong / or failed
Do you have the manual? This should tell you what the flashing means