Replace or upgrade in the Mid-2013

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How do you replace or upgrade the storage in the "Mid-2013," "Early 2014" and "Early 2015" MacBook Air models? Is it even possible?

 

[TheStu]

You look on ebay for a used SSD from a system of the same vintage, and install it. I did that with my 2010 Air (though 3rd party SSDs exist for that one).