Yes. Those are virtual disk which newly inserted drives were previously  part of. You can see the virtual disk name shown on preview page will be different than one you already have on the server. You can also click on the virtual disk name on the foreign configuration preview page and confirm the physical disk details.
Hi We have Dell  Power Edge R420 where it’s configured with RAID 10,So we would like to RAID10,but seems we can’t expand the RAID10 with current controller PERC H710 Mini Since we have installed 4 new disks ,So we plan to create new RAID ,But we seen 3 disks showing as Foreign  disk and one disk shows as Online So just wanted to check that if I clear [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] Operation Manager, will it cause any data loose with existing disk in RAID10. Please find the attached document where I m trying to clear Foreign configuration, it’s giving some warning information, so just wanted to check with you correct method to clear Foreign configuration .
Foreign Configuration clear in Dell RAID