I have a My Passport Ultra 1TB external drive with two 500GB Mac OS Extended (Journaled) partitions. I would like to merge these partitions back into a single full 1TB drive. Disk Utility displays the two partitions as separate disks, and disables the Partition button when I select either one.

Disk Utility

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    'Merge' how? Keeping all data, or just discarding & reformatting as a single volume? – Tetsujin Jul 12 '18 at 18:39

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