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While you can still continue using your computer during the migration process, once the migration process starts, it cannot be stopped. If the migration process gets interrupted and your system is rebooted for any reason, it will pick up the migration process where it left off.
You will be provided with an estimated completion time (the remaining time will depend on your system) once the migration process starts as illustrated in the following example:
The following screen appears if the migration process is completed successfully. Then you have to reboot your system to use the full capacity of the new volume.