Many high-end games, professional software, and cloud security applications now require Secure Boot and TPM 2.0 features, which are only supported when the system disk uses the GPT partition format.
Or, maybe the easiest thing of all would be to just keep the 2TB plugged in as the "backup" OS drive, and just make the 4TB drive a pure data volume? Wipe it so there are no boot files at all and just ...
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