If your "Just a Bunch of Disks" (JBOD) setup has failed, you're likely facing a "spanned" volume that no longer mounts or has lost data. Because JBOD lacks the redundancy of RAID 1 or 5, a single disk failure can jeopardize the entire logical volume.
Data recovery from the first disk in a JBOD array - Super User jbod repair tools download best
Here’s a concise, shareable forum/post text you can use: If your "Just a Bunch of Disks" (JBOD)