The action you can do to this HDD so that it will still work as a boot device for this system is The HDD must be partitioned with GPT to serve as a UEFI boot device.
Based on the fact that the motherboard is set to boo from either a UEFI device or a legacy BIOS device, to change the motherboard to boot only in UEFI mode, you would need to partition the HDD.
This refers to the process of a computer coming on from a relaxed or off state.
Hence, we can see that The action you can do to this HDD so that it will still work as a boot device for this system is The HDD must be partitioned with GPT to serve as a UEFI boot device.
Based on the fact that the motherboard is set to boo from either a UEFI device or a legacy BIOS device, to change the motherboard to boot only in UEFI mode, you would need to partition the HDD.
Read more about BIOS device here:
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