We both have the same issue - CORE will boot from USB but SCALE will not.USB to sata adapters, depending on model, can sometimes not be loaded correctly by the BIOS (or at all). It doesn't matter if the TrueNAS installer can see the drive, but if BIOD does. Because if it doesn't, no boot. Check if the drive is detected correctly at BIOS (its not enough for the adapter to be detected, the drive should be detected).