No security for intel macs in target disk mode?

By putting an intel MacBook in target disk mode, all the files are accessable by another computer which can mount the disk. If my machine is stolen, apparently I have no security. I found one post that says intel macs actually have some firmware password protection, but I have not been able to find how to turn it on. The Open Firmware Password feature does not work on intel macs. This seems to be a really big loophole. Having a login password is worthless if your machine is stolen. If anyone can help, please point out where there is more information on this issue.

If your computer is stolen firmware password will not protect your data. Even if the thief can't turn off the password, the disk drive can be removed and connected to another computer. Passwords, and other information, stored in keychains are still safe, however. The only way to protect other data is to use Filevault, Be sure to have good backups, because any error can make all your data inaccessible (as would the theft of the computer, of course).

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