Open terminal.app, and type the following commands: Lion will refuse to boot, due to this same istĬomputer is turned off, press the start button while holding 'alt' ('command' on US keyboards), you will see a list of bootable partition. You should now be able to install Lion without any problem Reboot your Mac on the Install_Lion partition We now have updated the installer (who checks your system at the install step), but don't close your terminal yet, we also need to delete 1 file who are used to check your system at the boot step Mv ~/Desktop/workingdir/OSInstall.mpkg /Volumes/install_Lion/Packages/ Xar -c -f /Users//Desktop/workingdir/OSInstall.mpkg * In Finder, go to the workingdir, on your desktop, and replace the Distribution file with this one. Xar -x -f /Users//Desktop/workingdir/OSInstall.mpkg Type the following commands, one line after one:Ĭp /Volumes/install_Lion/Packages/OSInstall.mpkg /Users//Desktop/workingdir/ Go to terminal.app and type 'su' to get root privileges (if root is not activated, then activate it) We will now edit the Lion installer in order to prevent any system checking (Ram, processor, and other stuff) You keep secured at any time, with this tutorial Keep in mind that you will be able to choose your startup partition at boot time while holding the alt (command) key when you hear the Mac startup chord. On the finder, Make a right-click > properties on each partition and change their names to match the following strings: This step requires some command-line stuff, and in order to keep that tutorial simple, you should change the name of your partitions: Step 4 (not necessary, I think, if you have downloaded my compiled version of Xar)Īssuming that you have Xcode and dev tools installed, download the Xar source code, extract it, and compile it, by using terminal.app If anything goes well, you will be able to see your 3 startup volumes in System Preferences > startup Restore the second 9Gb partition with your MAC OS X 10.7 Lion Developer Preview 1 disk image, using disk utility. Restore the first 9Gb partition with your Mac OS X 10.6 Snow Leopard disk image, using disk utility. 2 partitions with the remaining space, the first one being your current snow leopard partition, the second one being your target for the Lion install.

2 partitions of 9Gb at the end of your drive, the first one for a fallback emergency Snow Leopard installer, the second one for the Lion installer An external hard drive, to backup your computerĭo a full backup of your computer with TimeMachine.ĭepending on your drive capabilities, use disk utility to partition your drive that way: A Mac OS X Lion Developer Preview 1 copy (there's a bay full of pirates that can be useful.) An intel core duo/solo Mac computer (MacBook, Mac mini.) running Snow Leopard Please note that this tutorial is totally worthless since the Lion beta does not include most of the feature included in the final version.

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