eDrive, Lion, and previous versions of Mac OS

If you are using a previous version of TechTool Pro, and have both Lion and an older version of Mac OS X installed, it is recommended that you upgrade or update to version 6.0.3.  Using a previous version of TechTool Pro to create an eDrive on a volume that contains Lion can remove a Recovery HD installed there.  Version 6.0.3, when used with previous versions of Mac OS X, ensures that the Recovery HD continues to operate properly by preventing any actions that might accidentally remove it, such as creating an eDrive.  

If you need to run Lion and a previous version of Mac OS X, it is advised that the eDrive be created on a separate disk that does not contain Mac OS X 10.7 or a Recovery HD.