The primary HD, 500 GB, boot drive, seems to be acting flaky and I am wondering if it's about to give out on me. When I booted up the machine earlier today I got the infamous flashing folder with the question mark. Shut down, tried again and the machine booted up normally. I went ahead and downloaded and installed the update to OS 10.5 and once again when the machine tried to reboot I got the flashing folder/question mark. Uh-oh.... Machine booted up normally the next time, and I immediately began copying files over to an external HD. That process is finished and now I'm ready to attack the problem before it becomes a worse one. The machine has 4 500 GB HDs in it and I am thinking that maybe it would be a good idea to shift things around and use one of the other internal HDs as the primary drive (as well as replacing this one with a new, larger capacity HD). I've never done this before, but I think I need to install and use either Carbon Copy Cloner or SuperDuper in order to make a clone (including boot processes) of my current primary drive. Is it possible to do it without using one of these? Which software is the better choice if I decide to go that route? Should I run Disk Utility first to see if I can determine what's going on with this drive? I'd rather not wipe the drive if that can be avoided. Some nice, clear step-by-step instructions would be gratefully accepted! Thanks!