Acer Aspire can't boot external ssd

[ezshre]

Hello, I have an Acer Aspire f5-573G-28xs and an external Samsung Evo SSD with UNIX on it.
I can't see it in my BIOS nor in my F12 Boot manager.

Why is that? It works on my Desktop as well as the computers at school.

 

[gaius_iulius]

Have a look at your UEFI/BIOS:

- you have to boot with UEFI, not with BIOS (Legacy);
- your SATA devices have to be set to AHCI;
- Fast Boot, Fast Startup and Secure Boot must all be disabled.

 

[revotvchannel]

MERGED QUESTION
Question from revotvchannel : "Acer Aspire BIOS doesn't read external SSD"

Hello, I have an Acer Aspire f5-573G-28xs and an external Samsung Evo SSD with UNIX on it.
I can't see it in my BIOS nor in my F12 Boot manager.

Why is that? It works on my Desktop as well as the computers at school.

MERGED QUESTION
Question from revotvchannel : "Acer Aspire BIOS doesn't read external SSD"

Hello, I have an Acer Aspire f5-573G-28xs and an external Samsung Evo SSD with UNIX on it.
I can't see it in my BIOS nor in my F12 Boot manager.

Why is that? It works on my Desktop as well as the computers at school.