pletoolbox.blogg.se - Macbook pro os x lion install disk

After installing Lion on my iMac, I wanted to delete everything on my laptop and do a fresh install of Lion. But the installer will not install over an older version of OSX. – I have confirmed this working on a Macbook Air 11″, 2010, 1.6Ghz version.If you have a Lion installer on a USB thumbdrive, you can use it to upgrade your Mac from Snow Leopard to Lion, but if you have an older version of OS X you can’t upgrade. You need to first upgrade to Snow Leopard OR you can erase everything and do a completely fresh install of Lion. – I would recommend creating a separate partition for your OS X Lion installation as well.Hold Option/Alt after your see the Apple logo appear and boot with the thumbdrive in your Mac.Ĭhoose the USB Drive to install OS X Lion from your USB Thumbdrive! Once its finished, you now have a bootable OS X Lion install thumbdrive (basically just like what the Macbook Air ships with).ĥ. I recommend erasing the destination, so be sure to backup any data on the thumbdrive prior to this step! This will take a few minutes to do. (ie THUMBDRIVE in the screenshot) and then click Restore Once you have it chosen, click and drag your USB Thumbdrive from the left pane to the Destination box. Click on the Browse button and locate the. On the right pane, go to the Restore tab.ģ. This is very handy for us Macbook Air users that do not have an external optical drive.ġ.

We can then boot the USB Drive on our Mac to install OS X Lion from it. dmg installer file for OS X Lion onto a usb thumbdrive.

– USB Thumbdrive or Memorycard Reader w/memory card (4GB mininum, data will be destroyed).

– Mac running OS X Leopard or Snow Leopard.

– OS X Lion installation DMG (hint: file named: mac_os_x_10_7_11a390.dmg).

We will need a copy of the installer dmg (not provided) and a 4GB USB Thumbdrive or Memorycard Reader w/memory card and a Mac to convert the dmg to a bootable usb thumb drive. This recipe will explain how to make a USB Thumb Drive bootable with the OS X Lion Developer Preview installer on it and in turn allow you to install Lion on a Mac without an optical drive (ie Macbook Air line).