Disk Utility not burning my dvds

SouthPaw

Registered
I found an instruction manual online on how to burn dvds using the "Disk Utility" by saving the dvd as an image then inserting a blank dvd then click the burn button. Now I'v burnt some dvds that have a disk space smaller than 4.7 GB , and they burnt sucessfully onto a blank dvd of size 4.7GB. But here is the problem. When ever I try to burn a dvd greater than 4.7GB, there is always an error during the burn process. I even bought 8.5GB sized disks which is more than enough space but every time i try to burn, halfway through the process it stops and says an error occured, but it dosen't say what kind of error. And it even ruins the blank dvd. I bought a brand new computer 2 months ago, its the 20 inch imac with the superdrive so why does it not burn any dvds that is bigger than 4.7GB on disk utility? And what are the errors mean?
 
Your superdrive is only capable of burning 4.7GB DVD's. You would need to buy an aftermarket external "double layer" burner to burn more.
 
What does Apple System Profiler report for the recording capacity for your optical drive? (about this mac > more info)
 
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