Im using a 17" unibody macbookpro 2.66 early 09 to make a copy of my Leopard Disc to put in an offsite storage location. Im able to rip movies and burn movies (DVD-R, DVD-RW, DVD-DL), iMovie videos, iTunes cds, rip audio discs, etc. The media is Dual-Layer DVD-R in disk utility I burn it at the slowest possible speed (on both systems) at 2.4x After it writes the data to the disc and finishes, i get this lovely image: I tried doing a test install of it from the burned dvd and it installed fine.... =\ what the huh!? its done this twice. using the same media on a 15" 2.2ghz uMBP late 2008 gives me a completed successfully notification every-time. burn info: 17" Superdrive info: HL-DT-ST DVDRW GS21N: Model: HL-DT-ST DVDRW GS21N Revision: SA17 Serial Number: KZZ91OM5217 Native Command Queuing: No Detachable Drive: No Power Off: Yes Async Notification: No 15" Superdrive info: MATSHITADVD-R UJ-868: Model: MATSHITADVD-R UJ-868 Revision: KA14 Serial Number: dE0E4283 Native Command Queuing: No Detachable Drive: No Power Off: Yes Async Notification: No Log Files from the 17" uMBP Here are the Disk Utility Logs Here is from ~/Library/Logs/DiscRecording.log Any idears? THANKS!