You can use the following command to add multiple WAN optimization storage locations if your FortiGate unit has multiple disk partitions and you want to use more than one for WAN optimization storage:

Enter get to see the name of the default storage location. You cannot edit this storage location, but you can add new ones:

Where <partition_number> is the number of the partition to create a storage location in. This cannot be the same as the partition added to the default storage location. This command automatically adds a WAN optimization storage location with the name new_storage.