Build A Tips About How To Start In Target Disk Mode
Boot in target disk mode on the mac you want to use as the external drive, go to system preferences > startup disk, and click the target disk mode button at the bottom.
How to start in target disk mode. Start up in verbose mode. Eject removable media, such as an optical disc. Eject (⏏) or f12 or mouse button or trackpad button :
You should now see the desktop of the other mac. I didn't have a time machine backup and though i had my most important files. Apple support's only options were to try target disk mode or erase the disk and start over.
Select filevault and press the lock item bottom left to make changes. Transfer files between two mac computers using target disk mode. Select the main apple menu > system preferences > security & privacy.
Click target disk mode, then click restart when you're asked to confirm.