If you have lost your data while upgrading to Mac OS X Mavericks 10.9 then you must be looking to recover data after Mac OS X upgradation. Mavericks is the latest Operating system offered by Apple and it has several advanced features and application that makes it much more useful. Many people are upgrading their system to Mavericks as it is available as free update for Mac users. But there can be certain errors when you are upgrading and all your saved data will be lost from the system. It must be necessary for you to recover data after Mac OS X upgradation. The upgrade process should be performed carefully as it provides an option to create a back before installing the newer Operating system but many of you ignore it. Some times you can get an install failed error that can also lead to data loss. If the installation has failed try to reinstall it till you achieve a successful. But to recover data after Mac OS X upgradation to Mavericks you will have to use a recovery tool. Mac data recovery software can do this work effectively and efficiently. The software is quite easy to handle and you don't have to be a professional to recover data after Mac OS X upgradation.