After you selected specific drives or images as RAID participants, they constitute virtual RAID array and become unavailable for individual tasks. For instance, you cannot recalculate hash of one of such drives.
To use the individual drives that are a part of a mounted RAID array, you need to unmount the RAID first.
Follow these steps:
1. Click on Devices in the top right corner of the screen.
2. Scroll down to the bottom of the Devices panel to find the currently connected and mounted RAID.
3. Click the Unmount RAID button at the bottom of the page
Now you can proceed with other sessions, using any of the 6 drives connected to TaskForce.