Problem with not know what manufacterer is

This is a problem regarding my friends DVD Burner.
I do not know what manufacter is, because it is listed as ATAPI in BIOS.
This weird problem appeared when he shutted down PC while he was burning something, and watched movie at the same time.

Now, when you transfer anything from burner to hdd, it goes approx. 3MB/s no more, no less.
And while he is burning, using Nero, recorder buffer goes crazy, jumping even to 5%.

Can this be fixed, and is it possible that he somehow damaged burner while he was burning something and shutted down PC in middle of it?

It’s a bit stupid question about “shutting down”, but can it actually happen?