bilsch wrote:
On 4/30/2019 3:51 AM, JJ wrote:
On Mon, 29 Apr 2019 21:22:00 -0700, bilsch wrote:

I don't seem to have such a setting in BIOS.

I haven't seen any, but there a possibility that the legacy/compatibility
drive mode is not supported by some computers (for the sake of
reducing cost
to make them).

What's the model number and/or name of you Dell laptop?

Dell Inspiron 15 3565

The DVD drive is:
HL-DT-ST DVD+-RW GU90N.

https://www.dell.com/community/Lapto...g/td-p/5149207

https://vjauj58549.i.lithium.com/com...416e162ec.jpeg

Press F2 early after startup, as it may allow entry into
the BIOS screen.

The BIOS type is "APTIO" brand.

There is an entry there "SATA Operation" in the picture.
It is shown in the picture as AHCI. Check there to see
what other options are available.

RAID (not likely, module code removed)
AHCI
Compatible IDE ?

My experience with DVD drives, is that older OSes (and their
drivers) may not know what a DVD drive is. And this can account
for booting problems, or problems accessing the device.

To get Linux on my 440BX chipset machine, I had to load it
on a hard drive first, then connect the hard drive to the
computer. Using this method, I was able to bypass the
inability to read/boot from DVD drive. A CD drive works fine,
but not a lot of medias now come on CD sized discs.

Make note of what you change in the BIOS, because you're
going to need to fix that, before booting your
other OSes.

Based on that picture, your BIOS appears to be "full featured",
as the BIOS screen has a total of five tabs.

Paul