If you would like to re-use an array member, all you need to delete the raidset configuration in this drive as free and assign this free drive a hot spare disk. You can find the delete raidset function and create hot spare disk function in raidset function menu. If you do not want to delete RAID set and assign it a hot spare, you can set the “Hot Plugged Disk For Rebuilding” to “Always” in the web browser manager. It always triggers a rebuilding for the Degraded RAID set/Volume.