ok, my best friend has had an imac for a while now. she has the white one and i have just bought a new aluminium machine. now when she puts a dvd in her drive she can drag the video ts folder onto the desktop whereas I can't. It says i do not have permission for the operation. i am an administrator but when i look at info it states the dvd is read only. can i change that or have apply changed something in the new imac that will stop this.??