Every time I burn a DVD (data disc) from the finder, it will show up fine in my two snow leopard Macs. When I try putting it in my MacBook Pro that has 10.5 (this is from my university), it will not show up in the finder. Then, it will spit the disc back out. I tried it in a few other MBPs with 10.5, and the same thing happens. Any thoughts? Am I doing something wrong all of a sudden?