We received a 6-drive RAID array from a Data Recovery company in Austria. It had previously been to two other Data Recovery companies around the world. None of the three were able to recover the data, so they approached us.
Two drives in the array had been swapped over by the administrator and then a rebuild of the raid had been attempted. After approximately 1% into the rebuild, the process fortunately crashed, preventing all the data from being completely and permanently overwritten. This RAID controller was not an intelligent controller, and did not detect that the incorrect hard disks had been swapped out.
