Connect macbook air 2015 to M1 Macbook air

I want to transfer files from my early 2015 MacBook air to 2020 M1 MacBook air. Connected with the USB-A to USB-C cord. Tried using target disk method through system preferences. 2015 model goes into target disk mode but M1 MacBook does not show it. Is there any troubleshooting required, or is it not possible to transfer files through this method?

Solution 1:

USB target disk mode requires the target computer to have USB-C ports. USB target disk mode does work in spite of Apple apparently scrubbing all mention of it from their website. MacWorld documented it though: https://www.macworld.com/article/225340/got-a-new-macbook-usb-target-disk-mode-works-with-the-right-cable-which-apple-doesnt-sell.html

I've used target disk mode on my MacBook Pro by USB before so this is not some myth MacWorld created. I can only speculate on why Apple chose to hide this feature from users. One possible reason is to avoid having to describe the very specific system requirements and process to people.

A quick check of the system specifications on a 2015 MacBook Air tells me it does not have USB-C ports, that means target disk mode will not work on this laptop by USB. The M1 laptop should support target disk mode by USB, but in reading the Apple documentation on this the laptop shows as a network share rather than a USB device. Link: https://support.apple.com/guide/mac-help/transfer-files-a-mac-apple-silicon-mchlb37e8ca7/12.0/mac/12.0

It looks like all you got wrong is which laptop should be in target disk mode. Are you using target disk mode on the older laptop because it no longer boots? If so then Thunderbolt should still work. If not then try putting the newer M1 laptop in target disk mode and copy the files over USB that way.

Solution 2:

Target disk mode on Intel Macs requires USB-C, Thunderbolt, or FireWire on the target Mac, it does not work by USB-A on the target Mac. Can you try using a thunderbolt cable? (or airdrop?)

from Transfer files between two Mac computers using target disk mode :

If you have two Mac computers with FireWire or Thunderbolt ports, you can connect them so that one of them appears as an external hard disk on the other. This is called target disk mode.

Note: If either of the computers has macOS 11 or later installed, you must connect the two computers using a Thunderbolt cable.

Since the 2020 M1 MacBook Air shipped with macOS 11, this applies to you. You will have to use Thunderbolt if the target is the 2015 MacBook Air, or use the instructions linked to below to use the USB cable you have with the 2020 M1 MacBook Air as the target. Transfer files between a Mac with Apple silicon and another Mac