The SATA cable is the weak link, one of many reasons Apple went to the PCI-e and soldered-in storage. They can be damaged quite easily if the unit is mishandled during assembly or re-assembly. This type of cable can experience cracks in traces due to aging, heat, vibration, impact and abrasion. Those SATA cables are actually not cables but flexible circuit boards, usually mylar, with printed circuit traces taking the place of wires. As it cools down, electrical contact may once again be restored. As a unit heats up, it expands, and as it expands, the crack widens, eventually forcing a complete electrical separation to exist on both sides of the crack, hence a failure. That Mid 2012 model of the MacBook Pro takes a standard 2.5 format SSD drive. In the case of an intermittent generic failure, the electrical continuity of a cracked trace on both sides of the crack is very often a function of the temperature of the unit at the point where the crack exists. Does show use, doesn’t interfere with the purpose intended. It is however no mystery why old cables fail when switching from HDD to SSD. Apple MacBook Pro A1278 8GB 256GB SSD Intel C - 175 (Dallas, Tx.) © craigslist - Map data © OpenStreetMap condition: good Valued : 185 On Sale 175 Please Read: This MacBook was tested and inspected and works great. Agreed, a new SATA cable is a nominal expense and highly recommended. MacBook Pro 13' Core i5-3210M 2.
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