The 2011 MacBook Air uses a proprietary blade SSD, but you can still swap it

The 2011 MacBook Air’s SSD is removable, but it’s not a standard 2.5-inch drive — it’s a proprietary blade-style SSD that connects via a SATA interface. Third-party replacements exist, so you can absolutely go larger, just don’t expect to walk into Best Buy and grab one off the shelf. It’s upgradeable, with a asterisk.