diskutil list will confirm there is this hidden partition called "Recovery HD". If your system has the recovery system (and most Lion installs should have), it and the booter share a partition after your root volume. On encrypted systems, there is a small booter partition which contains the EFI application that asks for your password, loads the kernel from the booter partition and once the kernel found and unlocked your encrypted volume, system startup continues as usual.
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So, insert your install disk and open Terminal. If you're not sure if a disk will work for you, try the hint anyway, it won't harm your computer.
In any event, try to use the most recent disk that would work with your computer. If your Mac is old enough, you may even have success with a Leopard install disk. If it's an original Snow Leopard disk, that's older than Oct 2009, or if it's a more recent one, older than 10.6.3. For this to work your Mac model will need to be older than that install disk, that's when it was introduced, not when you bought it. Or you an use a Snow Leopard install disk. NOTE: It's best if you use the install discs specific to each Mac you have to guarantee AHT will work. To find out which it is for your model go here.
Note this may be the 'Applications' Disk, and not the primary install disk. Use the install disk that came with you Mac.
Fortunately, it's an easy feature to restore.įirst, you need an install disk. Apple now recommends you simply use the disks that came with your Mac. Unless you have a Mac released after July 20, 2011, Lion removes the ability to hold 'D' at startup to boot into Apple hardware test.
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