Macrium Reflect disk clone: Target disk has incompatible sector size

I formatted the 4TB ext HDD as NTFS to no avail

Why are you trying to clone to an external drive?

as a backup measure.
It cloned to the 2TB disk by the same vendor, really identical except for the size, 4tb vs 2tb.
SP=silicon power

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Samuria said:

Try deleteing all paritions and leaving tthe disk blank

Same error message as above

Incompatible Disk Selected - KnowledgeBase v7 - Macrium Reflect Knowledgebase - KnowledgeBase v7 - Macrium Reflect Knowledgebase

I see. That's fine, I can repurpose this device to something else.