MacBook Pro 15" Unibody Mid 2012 Hard Drive Replacement - iFixit Repair Guide
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Apple MacBook Pro 13" Mid 2012 2.5GHz i5 A1278 MD101LL/A Hard Drive/SSD Drive | eBay
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Apple 13" MacBook Pro (Unibody, Mid 2012) 2.5GHz 500GB HDD 8GB A1278 M
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Installing MacBook Pro 15" Unibody Mid 2012 Dual Hard Drive - iFixit Repair Guide
Apple Hard Drive Cable for 13-inch MacBook Pro (Mid 2012)
Does the mid-2012 13 MacBook Pro have an M.2 slot that I can use for an Intel Optane memory upgrade? - Quora