Yes, it's also listed in the noobs guide on
www.xbox-scene.com in the tutorials.
There are two things you can do if you son't wish to get another hard drive AND you want to be able to use Live; the first is ghetto, and that is to simply open and close your Xbox when you want to switch hard drives. (You pull it out and swap it with the original HD)
2 is much more feasible, you'll have to do a search, it's either here, or Xbox-scene, (I htink the latter) but it is a tut on cutting a VERY slim area from the Xbox chassis behind the DVD ROM drive to add an IDE cable that has an extra connector
( 1 for DVD, and TWO for Hard drives) so what happens is you connect ONE extra Molex power cable to power the external drive, then install a double pole doubl throw switch.
SO, BEFORE you would power on your box, you would use the switch to select which hard drive will have power when you boot. In essence you would have a totally legit drive, and a hacked box.
Other than that, you can TRY Config Magic Final, and through a MIRACLE it might be bale to unlock/lock an HD that X3 could not.