Why does UEFI not see the hard drive from the drive lot?

Question

Iron

I bought an Acer extensa ex2511g laptop and immediately put its hard drive into the optical drive slot, and put an SSD in its place and rolled Ubuntu 16.04 onto it.
The problem is that I have an urgent need to put Windows in parallel, and I would like to put it on the hard drive .
The problem is that UEFI generally refuses to somehow see my hard drive. In general, the laptop turned out to be quite problematic and refused to see GRUB by default. I had to manually specify the bootloader address in the BIOS settings.
Having removed the SSD and installed a hard one, I still managed to install Windu in Legacy mode, but I can’t make it envy.
Who can advise what I need to do?
PS For some reason, the BIOS does not see the flash drive with Windows in Uefi mode, which is why it had to be in Legacy. In general, dancing with a tambourine, but the result is 0.0 so far ....

Answer 1

UEFI cannot fail to see a working drive. If you boot into ubuntu and there is a second disk, then uefi also has it.
Have you looked in bios hdd priority ?
A flash drive, like all hard drives, will go in one step, you cannot prioritize booting, as before in the BIOS. Just choose a priority among them.
There is also an additional Boot menu available by pressing f12 (you must first enable it), this menu will display all media.
By installing windows in legacy mode and switching back to protected mode, you will not be able to start windows.
If when installing windows you do not see hard drives, then your sata controller driver is missing. I often had such problems on windows 7. After integrating the missing driver, everything goes away.