Wipe it so there are no boot files at all and just move the data over. The system will work fine if you have both boot drives as MBR and the 4TB drive as GPT. (Maybe even get another small SSD to use ...
I recently found a nifty "FreeBSD ZFS root installation script" and been reworking it a bit to suit my needs better, including changing it from GPT to MBR partitioning. However, I was stumped, even ...
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