I installed successfully using physical CD-R and physical DVD+R
on American Megatrends Inc version 1613 BIOS of 12/03/2008
running on Intel Core2 Duo (E8400, 3GHz, 8GB). The USB reade
was LG Slim Portable DVD Writer GP50NB40 (August 2014).
The media check took 5 minutes on CD and 2.5 minutes on DVD.
On the installed system, "dd if=/dev/sr0 bs=32k of=/dev/null"
was 48 seconds faster than the media check for CD,
and 24 seconds faster than the media check for DVD.