the screen on my Macbook Pro is some how cracked on the inside and has begun leaking liquid crystal on the inside of the screen. well i have to send it in to Apple and i received the box to send it in this past friday but being in the position i'm in i have had to use it and haven't sent my computer in yet. anyway i want to back up my hard drive just in case something happens...well i go to disk utility to do just that and i select my hard drive and tell it i want to make a read-only image and that i want to save it on my external harddrive... and then it tells me that "Unable to create disk "____" resource busy" !!! what in the world does that mean. i can't find it anywhere on the apple support page. can someone please help me fast! i need to send my computer off to get fixed.