Install Snow Leopard from External Firewire or USB Hard Drive: How to Upgrade to Mac OS X 10.6 Without a DVD Drive If you have a Mac without a functioning DVD drive (or a MacBook Air), you’ll need to find another way to upgrade to Snow Leopard, thankfully this is very easy, all you’ll need is an external firewire or USB hard drive. You’ll need access to a DVD drive *somewhere* so that you can make
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