“Thanks to Macfixit's excellent service in supplying exactly the right part to get my Macbook back on the road. If you have an issue with a hard drive not being found in a 2011/12 vintage macbook, make sure you check if the problem is with the drive or the cable. I ended up replacing both, but it was the information and service from Macfixit that solved the real problem (dodgy cables in these models). Thanks!”