Why won't the 1TB HD accept OS 10.12 Sierra?
How do I reformat the SSD to a GUID Partition Table Scheme when it's not a option in the Disk Utility?
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you need to boot into recovery mode and use disk utility there.
you cant use the erase function, you need to use the partition function and change it to 1 partition mode and click the options button and choose GUID
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