I have been using an LG GP65NB60 USB-DVD drive to rip some software installation DVDs to ISO using ImgBurn.
For a while, the drive was working normally. It is an 8x drive, meaning 3.3x at the smallest radius, and up to 8x at the end of the discs. Now, all of a sudden, it is running at half that speed, starting at 1.7x. ImgBurn is already configured to use the maximum read speed at that hasn't change. In the ImgBurn log, it still reports an 8x nominal read speed.
Why is the drive suddenly working at half speed?