How do I replace hard drive?
Remove old hard drive and put in new one.
Is this a good question?
It depends on which of the twelve generations of MacBook you have. The twelve generations cover nine years, and have four major incompatible technical architectures:
As you can see, each architecture has its own technique for installing/removing drives.
The new Retina MacBook (released March 2015) does not currently have a drive replacement guide, but the teardown demonstrates that it doesn't use a traditional SATA hard drive. Instead, it uses a PCIe flash module inserted into an M.2 socket on the logic board. It may be a while before replacement drives in this format are available.
So, we first have to identify your computer before anything else can happen. The model number (A11181/A1278/A1342/A1534) will be silk-screened on the bottom case. If you can boot your computer, the more-specific Model Identifier is available from System Profiler, located in your /Applications/Utilities folder. The Model Identifier, which IDs the specific generation of the computer, is listed in Hardware Overview.
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