The MacBook Air M2 has two USB-C ports with Thunderbolt and USB 4 support, both on the left beside the MagSafe 3 port, and one charge failure that people mistake for a port failure. When a USB-C device is not recognized, the cause is rarely the Air's port: a data-less cable, a hub that needs power, a drive that is not formatted for the Mac, and macOS's setting for accessories that decides whether a new device may connect. On the Air, check Privacy and Security, Accessories, which can be set to ask or to always allow.
An iFixit case describes an M2 Air whose MagSafe and USB-C ports both failed together, which is a board matter. The two ports share the controller on that side, so test a device on both before you conclude anything.
Differential
Likely causes of “Apple MacBook Air (M2) USB or Thunderbolt device is not recognized”, and how to tell them apart
- 1
A data-less or poor cable
What separates it The device charges but does not appear, or only some cables work
How to confirm Use a cable made for data, ideally the one that came with the device
- 2
macOS blocking a new accessory
What separates it A new drive or hub is ignored and a prompt may have been dismissed
How to confirm System Settings, Privacy and Security, Accessories: choose Ask each time or Always allow
- 3
A hub or drive that needs more power
What separates it The device connects and drops
How to confirm Plug the Air into power or use a powered hub
- 4
Lint or damage in the port
What separates it The plug wobbles or one port is dead
How to confirm Check both ports with a flashlight and compare a known-good device
- 5
A board fault
What separates it Both USB-C ports and MagSafe fail
How to confirm Book Apple
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which of the two USB-C ports fails, or both
- The cable and device models
- Whether the device shows in System Information, USB
- Whether the Accessories setting is on Ask or Always allow
Try in this order
0 of 6 completedTry the other port
ReversibleMove the device to the second USB-C port.
Try a different cable
ReversibleUse a known-good data cable.
Check the Accessories setting
ReversibleSystem Settings, Privacy and Security, Accessories.
Look at System Information
ReversibleApple menu, hold Option, System Information, USB: see whether the device appears.
Restart
ReversibleRestart the Air with the device unplugged, then connect it.
Book Apple if both ports fail
ReversibleWith several cables and devices, a failing pair of ports is a board repair.
Model-specific
What is true of this model and not of its siblings
- Where the ports are
- Both USB-C ports are on the left, with MagSafe 3 and the headphone jack on the sides.
- Speeds
- Thunderbolt 3 and USB 4 speeds up to 40 Gb/s on the M2 Air.
Stop boundary
When this stops being a self-service repair
- !If both ports and MagSafe fail with known-good accessories, book Apple
- !If only one port fails after a clean and a restart, ask Apple to inspect that port
- !If a device is warm or smells, unplug it and stop using it
Evidence ledger
Sources behind this answer
Cable and port tests.
The M2 Air whose ports failed together.
Cable, port and accessory checks.
Ports, MagSafe 3, Wi-Fi 6, one external display, adapters and weight for the M2 Air.
Exact questions
Common questions
How many USB-C ports does the MacBook Air M2 have?+
Two Thunderbolt and USB 4 ports on the left, beside the MagSafe 3 charging port.
Why is my external drive not showing on the M2 Air?+
Check the cable, the Accessories setting and whether the drive is formatted for macOS; the drive may also need power.
What is the Accessories setting?+
A Privacy and Security setting that controls whether a new USB or Thunderbolt accessory may connect.
Is a dead port repairable?+
Yes, at Apple, but it may involve the board.