I upgrading from an old 4.1 MacPro to the new "trash can" MacPro. But I have only one monitor. Is the display port "hot swapable"?
Mac Pro, OS X El Capitan (10.11), Radeon Sapphire 7950
TThe old Mac had 10.11.2. I guess the new Mac had 10.10.x. Anyway it said I could not transfer data until I had updated the new Mac.
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You do not need to update the older Mac -- that indicates you are not doing what lllaass recommended.
[When] you first boot up a new Mac you will be offered the choice to migrate from another Mac. Before you say yes to that you have to connect the two and boot the old one in Target Disk mode.
I did do that. But the old mac never showed up in the new macs migration window. finally had to boot all the way into, on the old mac, and launch Migration Assistant. Then the new mac saw the old mac but said the operating systems were different. the old mac had a newer system Had to create an account on the new mac so I could download El Capitan
Le me add one thing that effected starting my old mac up in Target Disk Mode. My Startup Drive on the old mac is a SSD card mounted on a Sonnet PCIe expansion card. For whatever reason, it is not seen as a drive. Right now I am using the old mac in Target Disk Mode because I have three storage hard drives that I need access to. The old startup drive does not show up.
The code to support Target Disk Mode is all in ROM. The (loaded) Operating system is not used for Target Disk Mode.
Any device that cannot be immediately and simply accessed in the same way as when your Mac was built will not be seen in Target Disk Mode. That includes drives-on-pcie-cards, a type not even imagined when your Mac was shipped.
Migrating between two Mac Pros
