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os sierra 10.12.6
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Booting/Speed Problems With External SSD
I seem to be digging myself deeper with my USB 3.0 Samsung T3 external drive that is running OS Sierra 10.12.6. The T3 has been my boot drive for my 2012 i7 16GB RAM Mac Mini since December 2016. I lost the ability to boot the SSD immediately after installing an Apple security update. When I...