How can I access my hard drive without any Operating System?

I want to access my hard drive without any OS,I want to get some impotant fiiles in the C before restore tne system . Someone told me that "hook it up via firewire to a computer and hold down the T key on the keyboard. This will put it in target mode and it will act as an external harddrive to the other... show more I want to access my hard drive without any OS,I want to get some impotant fiiles in the C before restore tne system .
Someone told me that "hook it up via firewire to a computer and hold down the T key on the keyboard. This will put it in target mode and it will act as an external harddrive to the other computer ...".what does it mean ?does this way work?please explain this way or tell me the details .....thanks !!!
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