Erase macbook air
Can’t find erase content and settings in system preferences under general tab. Need to erase entire system but can’t figure out how.
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See the following Apple Support article for information on erasing a MacBook Air: What to do before you sell, give away, or trade in your Mac - Apple Support
Note that step 2 "Erase Content and Settings" only applies to newer Macs. Use the other steps instead on older Macs.