How to Fix a Stuck or Frozen Mac Migration Assistant

Sue Wayne

Jul 21, 2026 • Filed to: Take Data Backup • Proven solutions

TL;DR:

To resolve a frozen Mac Migration Assistant without risking data corruption from a forced restart, bypass the stall by utilizing Target Disk Mode, migrating from a Time Machine backup, or transferring your data without the applications.
    ● If the progress stalls at "1 minute remaining," wait over an hour before intervening, as the system is processing numerous small cache files and forcing a restart can corrupt the new Mac.
    ● To use the fastest alternative transfer method, hold the "T" key while booting the old Mac to activate Target Disk Mode, which mounts it as an external hard drive via a Thunderbolt connection.
    ● For suspected hardware errors on post-2013 Macs, disconnect all peripherals and hold the "D" key during boot to execute an extended testing diagnosis that checks the system for hard drive issues.

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Mac Migration Assistant can appear stuck when it is calculating transfer size, copying many small files, moving applications, transferring user accounts, or finishing the final stage. A progress message such as less than a minute remaining does not always mean the process has failed.

Before forcing a restart, check whether the Macs are still active, whether disk or network activity continues, whether either Mac shows an error message, and whether the transfer involves a large user account or many app files. A safe fix starts with waiting, checking connection quality, and reducing transfer complexity before moving to disk repair or hardware diagnostics.

Why Mac Migration Assistant Stuck or Frozen?

Migration Assistant can get stuck for software, storage, account, or connection reasons. The most common causes include unstable Wi-Fi, disconnected Ethernet or Thunderbolt cables, VPN or firewall interference, large transfers, low free storage on the new Mac, damaged files on the old Mac, problematic applications, external drive errors, or a Time Machine backup that cannot be read correctly.

Some stages only look frozen. Apple notes that large transfers can take hours and may appear to pause. This is especially common near the end of migration, when macOS is finalizing user accounts, permissions, applications, and many small support files.

How to Fix Mac Migration Assistant Stuck or Frozen?

You surely are aware of all the reasons behind this problem. Now, you need to know all possible solutions to this dilemma. As every problem comes with a solution, you just need to apply that to your situation. However, you will be given the solution to your problem while mentioning the cause behind it;

1 Use Target Disk Mode on Intel Mac or Share Disk on Apple Silicon Mac

If Migration Assistant keeps freezing, directly connecting the old Mac as a disk can help you copy files or let the new Mac access the source more reliably. The correct method depends on the Mac model.

2 Stabilize the Connection Before Restarting Migration

A frozen transfer is often caused by a weak wireless connection, cable interruption, VPN, firewall, or antivirus software. Fix the connection before rerunning Migration Assistant.

1. Connect both Macs to power.
2. Keep both Macs awake and near each other if using Wi-Fi.
3. Turn off VPN, firewall, and antivirus software temporarily until migration finishes.
4. If using Ethernet, unplug and reconnect the cable on both Macs, or test another cable and adapter.
5. For faster Mac-to-Mac transfer, use a compatible Thunderbolt cable when supported.
6. Restart Migration Assistant and confirm that both Macs show the same security code when prompted.

3 Migrate Users and Documents First, Then Reinstall Apps

Applications, plug-ins, caches, and old support files can slow or freeze migration. If the process keeps failing, reduce the transfer scope.

1. Restart Migration Assistant.
2. Select the user account, documents, desktop files, pictures, music, and important folders first.
3. Leave applications, system settings, or incompatible old apps unchecked during the first migration.
4. After the user data is transferred, install fresh versions of apps from the App Store, developer websites, or original installers.
5. Copy missing app data manually only when you know where the app stores its data.

4 Run Disk Utility First Aid and Apple Diagnostics

If Migration Assistant repeatedly freezes while scanning the old Mac, the source disk or hardware may have errors. Check storage first, then hardware.

1. On the old Mac, open Disk Utility.
2. Choose View > Show All Devices.
3. Run First Aid on each volume, then each container, then the storage device itself.
4. If Disk Utility reports problems that cannot be repaired, back up as much data as possible before continuing.
5. To test hardware, shut down the Mac and disconnect external devices except power, keyboard, mouse, display, and Ethernet if needed.
6. On Apple silicon, press and hold the power button until startup options appear, then press and hold Command + D.
7. On Intel Mac, turn on the Mac and immediately press and hold D. If that does not work, try Option + D.

5 Migrate from a Time Machine Backup Instead

If Mac-to-Mac migration keeps freezing, a Time Machine backup can be a cleaner source because Migration Assistant can transfer from a backup disk instead of directly from the old Mac.

1. Create or update a Time Machine backup of the old Mac if possible.
2. Connect the Time Machine backup disk to the new Mac.
3. Open Migration Assistant on the new Mac.
4. Select From a Mac, Time Machine backup, or startup disk.
5. Choose the Time Machine backup and select the data categories to migrate.
6. Start with user accounts and documents first if previous full migrations failed.

Extra Tips on Apple Migration Assistant

1. Prepare both Macs: Update macOS, connect power, turn on Wi-Fi if using wireless transfer, keep the Macs close, and turn off VPN, firewall, or antivirus software temporarily.
2. Open Migration Assistant on the new Mac: Go to Applications > Utilities > Migration Assistant, or use Setup Assistant if the new Mac has not been set up yet.
3. Select the source type: Choose From a Mac, Time Machine backup, or startup disk.

4. Open Migration Assistant on the old Mac: Choose the option to transfer to another Mac.

5. Verify the security code: If both Macs show a code, confirm that it matches before continuing.
6. Select data categories carefully: Choose user accounts, files, folders, applications, and settings. Use disclosure arrows to migrate specific items when needed.

7. Handle duplicate accounts: If the new Mac already has an account with the same name, choose whether to replace, keep a copy, or rename the transferred account.
8. Verify after migration: Quit Migration Assistant on both Macs, log in to the migrated account, and check Desktop, Documents, Photos, email, apps, and external files.

Recover Files After a Failed Mac Migration

Migration Assistant does not delete information from the old Mac, but data loss can still happen if files are manually deleted, an external drive fails, a disk has errors, a Time Machine disk becomes unreadable, or a forced restart interrupts other file operations.

Conclusion

If Mac Migration Assistant is stuck or frozen, do not force restart immediately. First decide whether it is truly frozen or only processing a large transfer. Check power, Wi-Fi, cable stability, VPN, firewall, and antivirus software. If the issue repeats, migrate fewer categories, skip applications, run Disk Utility First Aid, test the Mac with Apple Diagnostics, or migrate from a Time Machine backup.

Use Target Disk Mode only with Intel-based Macs, and use Share Disk in macOS Recovery for Apple silicon Macs. If files are missing after a failed migration, check the old Mac first and use data recovery software only for local or external storage files that were deleted or lost.