I have a Macbook Air 2017 with 512GB SSD and I want to put the drive in a 2018 MacBook Pro that came with only 128GB.
What do I need to do this?
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You can’t do this.
The 2018 MacBook Pro storage is soldered to the logic board and is very different from the proprietary M.2 interface of the 2013-2017 MacBook Air computers. This applies to both the 15-inch and 13-inch models.
You either have to get an MacBook Pro with greater internal storage or you can remove the SSD from the 2017 and put it into an external enclosure; that’s if the 2017 MBA is otherwise useless. If it still has life, then get an external drive for additional storage.