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The hard drive isn't as easy to replace as it used to be, but it can be done. The hard drive is still considered "user replaceable" by Apple. It's strange that the hard drive is "user replaceable", but the battery is not.
After removing two Phillips screws and the hard drive bracket they hold down, lift the hard drive out of the MacBook by its pull tab and disconnect the SATA connector.
If you're installing a new hard drive, you'll need a T6 Torx screwdriver to transfer the mounting screws to your new hard drive.
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