I just bought an MBP mid 2012 (non-retina) a week ago. It is the last non-retina model that is still being sold by Apple (at least until now). The question is Was the MBP mid 2012 that is still being sold manufactured in 2012? If so why it comes pre-installed with OS X El capitan and the HDD is using the latest Hitachi HGST manufactured in Jul-2016? Does Apple only replace the HDD with the latest model and install the latest OS X version? How about the other hardwares such as processor, RAM, Mainboard, etc? I asked these questions to the Apple Store guys but they could not answer my questions. Thanks in advance.