Migration Assistant does not reject Share Disk thunderbolt connections.

Number:rdar://FB9864933 Date Originated:1/29/22, 14:01:02 EST
Status:Open Resolved:
Product:macOS Product Version:macOS 12.2 (21D49)
Classification:Installation/Setup/Migration/Recovery Reproducible:
Migration Assistant does not reject Share Disk thunderbolt connections.
FB9864933 — macOS

Basic Information

Please provide a descriptive title for your feedback:
Migration Assistant does not reject Share Disk thunderbolt connections.

Which area are you seeing an issue with?

What type of issue are you reporting?
Incorrect/Unexpected Behavior


What does the installation/setup/migration/recovery issue you are seeing involve?
Migration during installation

What build of macOS were you upgrading from?
macOS 12.2 (21D49)

What were you migrating from?
Another macOS installation

What time was it when this last occurred? (Example: 12:00 pm EST 02/14/2018)
11:02pm EST 1/27/2022


Please describe the issue and what steps we can take to reproduce it:
At present, Migration Assistant does not support migrating over Thunderbolt via "Share Disk," the Apple Silicon equivalent of "Target Disk Mode." See FB9864910.

If it is not supported, and until it is supported, Migration Assistant needs to detect this condition and inform the user that it is not supported, rather than displaying "Looking for sources..." and suggesting the user should wait.

1. Connect two 14" Macbook Pro machines via a 0.8m Thunderbolt cable.
2. Boot the source machine into Recovery Mode (holding down power button at startup)
3. Select Utilities > Share Disk, Unlock the Disk if necessary, and Start Sharing
4. Boot the destination machine and begin Migration Assistant
5. It displays "Looking for sources..." forever and never reports this is an unsupported configuration.

If the second machine is booted into the Finder, the shared disk is available via afp over Thunderbolt as described in https://support.apple.com/en-sa/guide/mac-help/mchlb37e8ca7/mac.


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