On M1-based Macs, you initiate Target Disk Mode using a command in the Recovery app’s Utilities menu: Share Disk. i have been setting up the mini manually as i want to make sure all the apps that can be UB are, so i did not copy wholesale the files from the tibook. Migration Assistant will work with a source drive running OS X Snow Leopard 10. Once your user loads, open up the Migration Assistant application, which is found in Applications > Utilities. When prompted to indicate how you would like to transfer your information, select the Transfer from a Mac, Time Machine, or startup disk. Target Disk Mode is the preferred form of old-computer to new-computer interconnect used by Apple's Migration Assistant. Now you’ve connected the two Macs together, or used Target Disk mode, you’re ready to use Migration Assistant. When you see the large target disk icon bouncing around the screen, release the key. Note: Target Disk Mode is Apple’s official recommended method for high-speed data transfer and emergency file access on macOS 10. Macos update assistant target disk mode Not the First Issue of This Kind.
