Burning disks was failing because of the PC's inability to keep the bufferr full all the time in the rate that the disk was spinning. You were selecting write speed. Let's say 24x. If you started doing something else on the PC and it prioritized that, it could reach to a point that it didn't have available in the buffer memory the next set of data to be written. The disk writer couldn't dynamically reduce the speed of spinning. So it ended up having nothing to write at said position. Then it could not resume. It all should happen in one go.