M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac
macbook air hard drive - YouTube
MacBook Air SSD Upgrade or Replacement Guide - YouTube
How To Upgrade Your Macbook Air with an SSD (2023 updated) | Upgradeable Australia
Amazon.com: 256GB SSD Hard Drive for Apple MacBook Pro Air 11" 13" 15" A1502 A1398 A1465 A1466 (Late 2013-2015) / OSX Sierra/Mac Pro A1481 : Electronics
MacBook Air 13" Late 2010 Solid-State Drive Replacement - iFixit Repair Guide
How To Upgrade Your Macbook Air with an SSD (2023 updated) | Upgradeable Australia