Hi,
I just sarted to burn DVD with my I-mac with Toast titanium and an external dvd burner (macdrive). When I start do burn (even with a 1X speed) I receive the following error message

"SENSE KEY = ILLEGAL REQUEST
SENSE CODE = OX21, OX02
BUFFER UNDERRUN"

The recording failed and my blank DVD is no use.

What does this mean? What should I do to work it out ?

Julos