I use fcp on an imac with a datatale 2 disk enclosure with two 2tb disks installed that shows as EXT HD 4.1 & EXT HD 4.2 on my desktop. Both the raid jumpers are in the off position . I recently purchased another 2TB HDD . Can I take out both the disks or any one of them to replace with the new disk? i want to back up data from EXT HD 4.1 and another usb portable 500gb drive to the new disk for transferring to another Mac?