I tried Migration Assistant, and it recognized the old drive and offered to transfer, but I let it run all weekend and it didn't get off the first step ("Looking for applications and documents to transfer … "). I can connect the two machines via Target Disk mode with a Thunderbolt cable/Thunderbolt 2-to-3 adapter. (Through a comedy of errors, my Time Machine drive isn't available.) I want to recover the ~1 TB of data on it and transfer to a brand-new iMac. Visit The Dallas Morning News on the World Wide Web at Distributed by McClatchy-Tribune Information Services.I have a 2015 iMac that no longer boots. I don't know of a similar mode on Windows PCs, though I have had friends pull a bad drive out of a PC and use a specialized USB adapter or external drive enclosure to mount the drive for copying. My friend didn't have the best outcome, but at least she knows what steps to follow next time. Sometimes the entire target drive is a goner. Sometimes certain files might be a lost cause. If copying the same file or folder locks up the Mac again, try some other files. Press and hold the target Mac's power key until the screen goes dark and boot into target mode again. If that happens, the FireWire symbol on the target Mac's screen will stop moving around. I've seen Target Disk Mode appear to be working, but if you happen to be copying a file that's on a bad place on the drive, you might just lock everything up.
The tricky part is when the target Mac's hard drive is too far gone. Once that happens, you can open the drive and copy the files.
If everything is working correctly, the target Mac's hard drive should show up as a second drive on the working Mac. That FireWire symbol will appear in different spots every few seconds like a screen saver. A large FireWire symbol will show up on the target Mac's screen, usually in less than 20 seconds, meaning you can let go of the "T" key. Then power on the target Mac and hold down the "T" key as you hear the start-up chime. You use a FireWire cable to connect the "target" Mac (the one with the bad drive) to a working Mac.
Because she was using a Mac, she had an option that PC users lack: Target Disk Mode.
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