That's how my 2 disk NAS is setup (DS212). Each disk is a separate volume. No RAID. Shares can be on the selected drive. And I have the NAD auto-backup configured to dupe files on volume 1 to volume 2 as backup, with these being on different disks and different file systems. Seems more resilient to me than RAID1 - as I have had a file system get corrupted on PCs a few times.