![]() The SATA cable is the weak link, one of many reasons Apple went to the PCI-e and soldered-in storage. SATA I offered a maximum 1.5 gigabits per second (150 megabytes per second) transfer rates II doubled to 3Gbps (300MBps) and III doubled again to 6Gbps (600MBps). ![]() 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. Sintech 24Pin M2(SATA) 2280 SSD Card,Compatible with 2012 Year MacBook PRO Retina SSD (Only fit M.2 SATA 2280,Not Fit M.2 nVME SSD). 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. 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. The HDD comming with the MBP it is said to be a SATA 3Gb/s. It continues However, SATA 3Gb/s SSDs and hard drives will work without issues in the optical bay. It is however no mystery why old cables fail when switching from HDD to SSD. In the OCW Installation Video: The 2012 MacBook Pros optical bay can not reliably support 6Gb/s SSDs and hard drives. ![]() ![]() Agreed, a new SATA cable is a nominal expense and highly recommended. ![]()
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