Are you in a situation where Upgrading from Mac OS X v10.6 does not work with software RAID ? The Mac system that you are using is connected with a RAID setup which means multiple hard drives are working simultaneously. There is a single operating system Mac OS X 10.6 controlling them all managing the data stored in it. However your decided to upgrade the operating system so that you use its new features. But there occurred a problem and Upgrading from Mac OS X v10.6 does not work with software RAID. The operating system files are saved in the main hard drive and it may have been corrupted in the process. So you need to repair it first and if some how any data has been lost then you can try to get it back with the time machine that you have set up earlier. If the backup is not available then you can use the Mac data recovery software. It is a handy tool that can be used to scan the Mac hard drive for the lost files and then you can make the selection for recovery. So download the software now and use it when Upgrading from Mac OS X v10.6 does not work with software RAID issue fixed.