Well he is burning it correctly but it still looks like a disk issue. If 5x isnt working try 1x. Even if the disk checks out after you burn it may still give you problems.

As of now you can narrow it down to one of three things:

1. The burning of the disk

2. The source disk IMAGE

3. The media itself (though these days you would have to buy some pretty low end media for it to cause problems like these.

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