The best tools never write to a failing JBOD. They create a virtual reconstruction of the concatenated volume and allow you to extract data to a separate healthy drive.
High-quality tools analyze disk signatures and file system footprints to determine the original JBOD sequence, even if the disks are shuffled. jbod repair toolsexe high quality verified
Look for tools that have been verified by independent testing labs like VirusTotal (low detection rate) or AV-Comparatives. A "high-quality verified" tool should score 0/60+ on VirusTotal. The best tools never write to a failing JBOD