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Re:Mac OS X Lion Login Passwords Extracted With Ease by zdw on Tuesday July 26, 2011 @10:39AM (#2807514)
Turning on the firmware password (Either EFI or Open Firmware on PPC machines) disables firewire DMA.

This is a well known and common lockdown procedure for security focused Mac admins, especially as it also prevents booting off of alternate media.

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