Xbox360 Strange Burning Problems

Hi Guys , Im new to AfterDawn , so sorry if i posted this in the wrong place, so yeh

I have a Samsung Xbox 360 Flashed Drive
Ive Got a Backedup StreetFighters 4 game
verbatim disc's burning at 2.4x the ones made in Singapore
Got a new Duallayer Pioneer 216d burner
and using CloneCd,

First time it worked perfectly gave the backup to my friend so he could try it on his flashed xbox and worked on both of ours perfectly,
Now ive tryed again to see if i could make a second one , and its failed . 3 times .
So how come it worked perfectly the first time? and the other 3 times ive burned it ,it would just read in my xbox360 and just tell me to open drive afterwords like there was nothing there? But yet theres data on the disk. Can someone please help me ?