Question M.2 will not recognize HDD

[21stHermit]

Updated my Acer E15 laptop with a M.2 SSD. Created a Win 10 recovery disk on a USB flash drive, Built a working Win 10 on the M.2, Can boot from either the M.2 or the HDD. FWIW the HDD is a Toshiba 1TB and the M.2 is a Adata 240 GB.

When I boot from the HDD, Windows sees the M.2 SSD. When I boot from the M.2 drive, Windows does not see the HDD either in Win Explorer or Disk Manager.
No amount of BIOS boot swapping has helped.

Is their a solution?

 

[21stHermit]

Will not Boot from either drive!

Apparently a Win 10 update gave me the big shaft,

Tried to boot from the HDD via F12 at boot, no go. Opened BIOS, F12 disabled. Enabled F12 in BIOS and from that point on the Acer would NOT boot. Nothing I did in BIOS helped. Neither the SSD or HDD would boot.

Tried to reinstall Windows via the recovery drive, that failed.

Any thoughts?