Hey there!
As you may have noticed I am new to Linux! I have to install pfsense and I did well enough, but in my way I lost a disk... Pfff... Long story, let me explain. At first I created a raid 1 with two disks, by using BIOS and then as I couldn't install pfsense from UEFI I decided to use legacy and I passed one of the disks as I was installing it. Thankfully it works. Now I am able to see the other disk but I can't add it in the mirror that I created, neither use it generally. I believe that the previous function changed its format. Unfortunately pfSense allows only basic Linux commands.

Thank you in advance for any help you can provide!
Helen

pfsense isn't Linux. You may get better help by posting in a more appropriate forum.

Would this be because the partition(s) are not mounted?

Hello again!

Pfsense is Linux, exactly pfSense is an open source firewall/router computer software distribution based on FreeBSD.

I tried to mount it but this is not the problem. The problem is the different format and the way that I don't know how to format just one of the disks. I believe that because I found how to create a mirror, but I can't insert it there...

Thanks!

As already pointed out, Pfsense is not Linux, it is FreeBSD based.

FreeBSD is not Linux. You will get better results posting to a more appropriate forum.

How did you create the partitions on the disk that you cannot see? Do they appear in the /etc/fstab file?

Many disk utilities will not create a valid BSD partition type (slice). You should allow the FreeBSD (Pfsense) installer to create the necessary partitions, or use the disk utilities provided in the OS for that purpose.

FreeBSD is a free Unix-like operating system descended from Research Unix via the Berkeley Software Distribution (BSD).

That is correct. It is not Linux, which is a Unix-like operating system not descended from Research Unix. There are substantial differences in the implementations and in the tools that are commonly provided.