The live drive is like a live Linux CD, but with Linux installed on a removable hard drive instead. I've installed Red Hat 9 on dev/hdc and moved it from an AMD K6-3 PC to an AMD K6-2, to an Athlon, and back. It works fine, as long as I keep it at dev/hdc; and Kudzu detects the new hardware. I install LILO onto the root Linux partition of dev/hdc so I can boot it from Smart Boot Manager on a floppy disk or from the bootloader on the mbr of the PC. We have a CCLUG PC fitted with a Compaq removable hard drive enclosure, so a user can do a custom Linux setup at home on dev/hdc and then bring it in on the hard drive in a compatible Compaq removable hard drive enclosure tray, or to put in our empty tray, and then run it in the CCLUG PC.
To avoid the "duplicate /boot partition not mounted" error, edit /etc/fstab changing LABEL=/boot to /dev/hdcx where x is the number of your boot partition, such as hdc2 on my system.
Removable hard drive enclosures fit in 5.25 inch bays and have removable inner trays that hold the hard drives. Once an enclosure is installed in a PC, a hard drive is connected inside the tray, the tray is inserted into the enclosure, locked into position and activated with a key, and then it should work as an installed hard drive. -JD