Lately, whenever i create a data disc in EMC 8, i have been getting this error message after the burning is complete. It says that some of the files do not match their originals, and it is reccommended to re-burn and shut down all programs running in the background. I check the disc to see if all the files i put on them were there, and they were intact. It also seems that it only happens with my external DVD burner, not my internal CD burner, i have a laptop. Now this has happened twice so far, with a DVD and a CD. Why?

It's possible you are getting a buffer underrun with the external drive (not knowing if your connection is USB1 or 2). What you could do for the external if this is the case is not to write directly to the drive but to make an image fiole (select the hard drive as the destination) and make a .iso file. Open that with Disc Copy and it should write to the external

Is there any way to fix this buffer underrun?

As I said before - if your computer USB is 1.1, then, no it isn't possible. For a good transfer rate you need USB2 (or if the drive has a firewire connection and the computer has a firewire port, then that would be better)

Does that mean you opened each of them to confirm they work, or merely that you checked to make sure they were on the disc, and the disc indicated the correct size?

If the latter, you are probably getting the info from the TOC [Table of Contents], which should report out correctly even if there was a problem and the file is either not usable or even not there.

Also, since optical media does deteriorate over time, the fewer errors you start with, the better.

Lynn