How can you change the primary partition in Disk Utility?

Question

I have made another partition using Disk Utility to install Snow Leopard. On my main partition Lion is installed but when i boot into Snow Leopard and try to delete the Lion partition it comes with an error "This operation requires a newer version of Mac OS X for this disk". I tried deleting the partition from Recovery HD but it says it couldn't unmount the disk.
Is this because Lion is the main partition, can you even delete the main partition?
And if I do delete the main partition will i be able to move the Snow Leopard partition "upwards" in Disk Utility?

Answer 1

ralphfromhome wrote:
1) First of all what is GUID.
It's the "partition map scheme" Apple uses so your firmware knows what is what on your boot drive, what partitions there are and what format they contain.
2) Secondly, would I just be able to make a new image in disk utility and use that instead of an external hard drive?
No, you need something to boot off of and remove all data off the internal drive that's going to be reformatted with a new parttion, that's why you use the free Carbon Copy Cloner, it does both in one shot and it "blesses" the drive to make it bootable.
3) When I use Carbon Copy cloner will it only copy Snow Leopard Installation or all of my files also?
It copies everything in your Snow Leopard partition to the external drive, files, programs the OS everything except whats in the Trash.
4) In your 8th step you mentioned repairing permissions on both. Both of what?
Both drives, the internal and the external clone in Disk Utility (ignore the long list that appears)
It's a safety check to make sure your permissions are set back to original settings, I think the newer version of CCC now does this, but I havent' checked, doesn't hurt to do it again.
5) If you still feel like typing can you tell me how long this whole process might take?
Formatting a external drive
You should Erase with Zero option first, that will take a hour per 500GB
Formatting shoud be rather fast, a few minutes.
Cloning Snow Leopard to the external drive should take about a hour per 500GB
Formatting the internal drive a zero erase first for safety should take another hour per 500GB
Reverse cloning Snow Leopard back onto the internal drive should take another hour per 500GB
Good thing about it, it's pretty much all ciick and go watch TV while it works.
I was actually planning to make a Genius Bar appointment to fix it, by the way does that cost much?
No idea, but you don't have to pay if you get a external drive for $70 or so, CCC is free.
You get to keep the external drive and use it later for cloning as hard drives die all the time, the clone would get you back to using the computer.