The new iMacs just released this past week appear to have 10.2.7 installed. The only other systems that have 10.2.7 preinstalled are the G5s. What do the two have in common that all the other machines with 10.2.6 do not? USB 2! So it would appear that the USB 2 drivers must be installed on 10.2.7. The question is, can you install 10.2.7 on an older machine without USB 2?