Well, I just had to dig this one up. Anyways, the problem I am haveing is regarding my Matshita UJ-857E in my Macbook Pro. I have recently been making copies of my games to have as backups, however when I burn the .iso file, and then put the game in the Xbox 360, all i see is the "open tray message". I tried the same disc in a friends Xbox and he got the same thing. At first I thought it was just a bad burn or something, so I burnt another cpy. Same thing! I am currently using Verbatim DVD+R DL. I had been using Memorex discs but I was having trouble with the drive wanting to calibrate the laser on those.
To verify that my media wasn't bad, I took a disc out of the batch I purchased, and burnt the .iso on a friends PC, and it worked fine. I have tried OSX360 (with both the Apple and growisofs methods) and Imgburn in Windows XP (Virtual Machine). Both have produced the open tray syndrome.
We tried the rubberband method(for about 2 hours), and it did not work. I was wondering if there was anything else someone knew to try. Maybe changing some settings. I dont know.