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OWC teardown finds removable SSD in entry-level 13" MacBook Pro without Touch Bar - 9to5Mac
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Amazon.com: JSER USB 3.0 to 16+12 Pin Air Pro 2013 2014 2015 2016 2017 SSD Portable Case Mobile Box HDD Enclosure : Electronics
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MacBook Pro Retina 15.4-inch (2016) - Core i7 - 16GB - SSD 256GB Space – Tekhouz Solutions LLC
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Amazon.com: Late 2016 Apple MacBook Pro Touch Bar with 2.9GHz Quad-core Intel Core i7 (15-inch Retina, 16GB RAM, 2TB SSD) Silver (Renewed) : Electronics
Touch Bar MacBook Pro models have non-upgradeable SSDs, seemingly under-sized batteries - 9to5Mac