How to put a Macbook Air into "Target Disk Mode"? I have an older Macbook Air. I'm trying to transfer the data onto my new Macbook Air using a Thunderbolt cable. The Apple Store employee assured me that you can connect a Thunderbolt cable to a mini display port. However, using Migration Assistant does not recognize that the two Macbook Airs are connected via the Thunderbolt cable. I learned that you might be able to put the old one into "Target Disk Mode" and treat it like an external start-up disk. However, I can't seem to get it to work. I have shut down the old Macbook Air and started it up while holding down the T key. I have also tried enabling it through System Preferences, but there is no Target Disk Mode option. Both Macbook Airs are running Mavericks.

How can I enable target disk mode so this migration doesn't take days?
In the "startup disk" section of system preferences, you should have a button to restart in target disk mode. If this is missing/ disabled then the machine doesn't support Target Disk Mode.