This means that the file system wasn’t detected at that location. This either means that you were not using RAID 1, or that the file system is damaged beyond recognition. If you were using RAID 1, you might still be able to use data recovery software or professional data recovery services to recover your data from the drive. As long as we’re in an Ubuntu session, the following documentation from the Ubuntu community may still help, and the instructions should still be applicable to Ubuntu 10.04 LTS or Ubuntu 10.10.
http://help.ubuntu.com/community/DataRecovery
If you were using RAID 5, I hope to have a similar walkthrough soon, but the really short version is to use a Fedora live CD with at least three of the drives and choose “NASRAID” from the Places Menu.
http://fedoraproject.org/get-fedora
If you were using RAID 0, you can try the Fedora CD but if the RAID array was damaged then it is likely that your data are not recoverable. Best of luck!
