You have created a new storage space using a single 500 GB external USB 3.0 drive. The drive is becoming full, so you add another external 1 TB USB 2.0 drive to the storage pool. Now that you have two drives, you would like to create a volume with storage space resiliency set to two-way mirror. You create the new volume with two-way resiliency and a size limit of 1 TB. As you are copying files from the C: drive to this new volume, you receive a warning that you are running out of space. Only a few hundred megabytes have been copied; why might you be receiving the warning so quickly? What can you do about it?