It is a great disaster for you when the Mac OS X goes corrupt, you must be looking to fix it and recover Mac data after OS failure. You were using the Mac system for quite some time and there are lot of data saved in the Mac drive that you want back. The reason for the corruption of the Mac operating system can be that the start up disk is having some issue and the files of the operating system are not loading. It may have been corrupt or infected by virus. If you have upgraded the OS and there was any error in between then also the corruption can occur. Now to fix the corruption and recover Mac data after OS failure you first have to format the drive and reinstall the operating system. The data can be recovered from any personal backup or time machine which saves a copy of files present in the Mac drive. If the backup does not work then you have to use the Mac data recovery software which is well equipped with advance techniques to find all the data and restore them back to complete the process of recover Mac data after OS failure. So get the software now.