Click on the Customize button and a new window will appear.Click the Show All Disks button and select your USB flash drive.Enter a name for the volume (I called mine “OS X USB”), select “Mac OS Extended (Journaled)” as the Format, and make sure the size is somewhere around 15-16GB. Go to the Partition tab and select “1 Partition” from the Volume Scheme menu.Open Disk Utility (Applications > Utilities) and click on your flash drive in the list on the left.Make sure there’s no valuable data on there because it will be permanently wiped out in a couple minutes. To start things off, connect the USB flash drive to your Mac.And the third thing you’ll need to get the job done is your OS X installation DVD.
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While they should be fine, squeeze those versions of Mac OS X on a 16GB drive at your own risk. Keep in mind 10.6 Snow Leopard was used to demonstrate this tutorial, so I’m not sure how much space 10.5, 10.4, and earlier require. Second, at least a 16GB USB flash drive, such as this SanDisk Cruzer Micro for about $30 at Amazon. First you’ll need an Intel-based Mac from the past few years.
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Now that you’re convinced, let’s figure out how to do this.
Although Macs are reliable machines, they are not exempt from hiccups.