* Next, click the “Restore” tab within Disk Utility

* Click OK to create the GUID partition (this will reformat the drive, ie: all data is lost) * Select the top option for “GUID Partition Table” – it MUST be GUID to be bootable! * Select 1 Partition, then click “Options” below the partition scheme * Click “Partition” from the menu options * Select the External Firewire/USB device that you want to use as the boot drive for the upgrade Install Mac OS X 10.6 Snow Leopard from an external Firewire or USB drive * Click OK and wait for the image to be createdĮasy enough right? Ok so here’s how you create a bootable Snow Leopard installation drive out of your external firewire or USB hard disk. * Name the image and put it somewhere you can find it easily (Desktop) * Click the “New Image” button at the top

* Select the Snow Leopard DVD within Disk Utility If you do need to, you can create a DMG file of the Snow Leopard disk, this is very easy. As some readers pointed out, this step isn’t required.

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