Cant mount secondary HDD

[megavolt]

Here is a common list of what needs to be changed on the BIOS/UEFI Settings:

@linux-aarhus

Firmware

---

The firmware is a crucial part of your system as it controls aspects on how the Linux kernel will interact with your the hardware. Some system firmware is setup in such a way that a Linux system does not recognize disk devices.

Firmware checklist for BIOS systems

• Use latest available firmware
• Disable EFI
• Disable RAID option
• Enable AHCI

Firmware checklist for EFI Systems

• Disable CSM (Legacy) boot
• Disable Secure Boot
• Enable AHCI
• Use latest available firmware
• Disable Optane Memory and Rapid Storage Technology (RST)
• Disable RAID option
• Disable Fast Boot (if unable to boot from USB)

Some systems require the user to set a firmware password before more advanced options becomes available.

My guess is that RAID is enabled on your UEFI and you need to switch to AHCI.