This is most unfortunate. RAID 1 is a fault-tolerance system that allows for continuous data access in case of an individual disk failure, however, it does not protect against data volume corruption or controller failure. Both disk drives inside the controller casing should be accessible for recovery purposes on Linux-based systems able tu support the EXT3 file system, unless they (Disk drives) are corrupted.
If Data Recovery is imperative and a proper recovery environment is not accessible, then perhaps you could try contacting Western Digital’s select data recovery partners.
