Matthew wants to transfer old files from his old computer to his new computer. Leo says that Matthew can use an ethernet cable, Firewire or even Thunderbolt and put the old computer into "target disk mode." This will treat his old Mac as a hard drive that will mount on the new Mac. Then it's just a simple drag and drop of his files.
target disc mode
Dennis has an old iMac from 2006 and he's having problems getting it to boot up. How can he move files from the old Mac to his new Mac? Leo says that there's a utility option called "Target Disk Mode." Press and hold "T" on startup and it'll put the Mac into Target Disk Mode. This means the Mac will appear as an external hard drive to the computer it's connected to.