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#Switching between Lion 64-bit and 32-bit

#To check which mode you?re currently in, run this command on the terminal: systemsetup -getkernelbootarchitecturesetting

#To set your machine to boot into 64-bit mode, enter this command and reboot: sudo systemsetup -setkernelbootarchitecture x86_64

#To set your machine to boot into 32-bit mode, enter this command and reboot: sudo systemsetup -setkernelbootarchitecture i386