How to set SSD and HDD in the bios (AHCI, IDE...)

AHCI, IDE are different.
Once the model is settled,
and install the operating system.
Don't try to change this.
Or you may fail to read the disk.
To make the matter worse,
it would be possible to
loss all data on the disk.

Fking said:

The thing is quite often on forums people ask for apples and other members try to help them by offering oranges, that's why i get a little annoyed sometimes and just tried to keep the focus of the thread.

I've been doing overall I.T. support for 16 years, and have been active on forums such as this for a decade. 99.9% of the time, a person is asking for apples because they are unaware that oranges are a better solution or process than what they are doing. The cardnial rule in any kind of support is to give the person the right/best answer, and that isn't always what they want or are expecting. I'm not pointing any fingers when I say that, I'm just stating it so you see where others are coming from.

Fking said:

I have no idea why it says RAID in front of the samsung SSD.

It will list the drive as RAID because you have it connected to a RAID-enabled port. It basically can be considered as a JBOD array containing only one disk. It's basically just an identifier, and nothing more. The performance seems to be good, the alignment is correct (assuming you have the 100 MB partition on the drive), so unless you have stability issues, I'd say it's working as expected.